Melting Surfboard Foam with Resin - Don't Make This Mistake!!
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- Äas pĆidĂĄn 20. 10. 2021
- A fun Halloween themed video showing what types of surfboard foam are compatible with different types of resin. Mixing the wrong combination can lead to melting your blank! This can be confusing when getting started with shaping and glassing so I wanted to help visualize the options. I am sharing just the basic information and most common materials used. There are other options not mentioned in this video and additional pros/cons that could be discussed but I wanted to keep it as simple as possible.
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I love surfing, building with my hands and making videos. Bendheim Boards is my outlet to fuel these passions. I'm self-taught and am not an expert, but these videos show the process that works for me. Follow along for new videos every month! - Sport
![Surfboard Shaping & Glassing [High-Performance Shortboard]](http://i.ytimg.com/vi/rYYuDt8Z2cY/mqdefault.jpg)
![Surfboard Shaping & Glassing [High-Performance Shortboard]](/img/tr.png)
![Surfboard Ding Repair & Color Match [PU Foam + Polyester Resin]](/img/n.gif)
The best explanation I've seen about resins and blanks so far. Very simple and playful. Thanks!
Cool man, glad to hear it!
That was very interesting and inspirational, plus educational as well for others who do that kind of thing on surf boards.
Great video... cheers from Senegal, West Africa
Thanks for the video and visuals, very informative! I would love to see a video on sustainable resins/blank materials.
Appreciate the feedback, glad you enjoyed it!
Great video, thank you for posting! Iâm a woodworker and needed a foam / epoxy combo and this video fit the bill perfectly.
TB. Thanks for the info. I want to strengthen my Sailplane and this Video made it easy to pick which Resin to use with Kevlar Fiber. Thanks. Gregory of Ohio
Awesome, glad to hear it Gregory!
ABSOLUTELY loved your video the start was very funny and you prevented me from a big mistake very informative thanks..........
Im not a shaper but was always curious how resin paint works, you did a awesome job explaining both on eps and epoxy blanks, hats off to you sir đ€đŒ
Thanks!
Great video man, Someone needed to do it, and you made it fun.
Thanks!
Awesome!! By far the best PU/EPS comparison available on youtube
Thanks, glad to hear it!
very good vid! thanks alot, this explains the big hole in my paddle board - a failed repair attempt because I used the wrong resin, now I know why. much appreciated
Yep learned that one the hard way on my first board attempt. Tried to salvage it with expanding insulation foam.
Also PU + Epoxy is my favorite combo.
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Fun video with more great tips! Using EPS I do miss that sparkling white look of a new PU / PE board but to me the light weight and durability make the sacrifice worth it. As always thanks for sharing!
Thanks for sharing, I've really enjoyed my EPS/Epoxy board as well.
I realize this is an old comment, but I have some really old EPS/epoxy boards that are still perfectly white/clear. PU/PE is much more prone to yellowing, assuming you're using good epoxy/blanks.
It's been that way for many, many years.
I've been riding both here on Oahu since maybe 1990 or so.
Best explanation ever!!! Great examples and silmple explanation. Congrats, shout out from Brazil !!
Obrigado cara đ€
thank you senior the information is very useful for me who is learning with resin on styrofoam to make my fishing boat
Thanks for the video. For a dramatic effect, pour some acetone on an EPS blank (sound on, the melting sizzles) I.e. be very careful having acetone around for cleaning when working with EPS.
Other EPS considerations (for a backyarder/hobbyist): Thicker blanks, takes longer to adjust thickness. Probably better to adjust thickness before cutting the outline. It seems harder to shear the rails with cells, thus more touch up work on the rails' edges , or see and feel differences, thus more micro asym patterns (at least for a hobbyist, like me), The speckling of the EPS blank, seems simple but also needs sanding, Rough and light sanding leaves stripes which you'lll see through the glass. Smooth sanding touches the blank. My 2 cents for first few boards. Minimize speckling and go with no color, or a go for a swirl with light colors will camouflage a lot of the freckles/buckshot, or go full opaque (sample glass on left of pieces)
Never poured acetone in the blank but wouldnât doubt the effect!
Also a question of yellowing over time, flex etc. So many variables but I prefer PU with traditional resin as they have held up for many years as long as theyâre taken care of. Thanks prof3ssor.
Epoxy does tend to yellow more than poly. Epoxy is supposedly more flexible.
*SPOOKED!* crazy it can melt like that
Very well done !
Great vid man really interesting!
Thanks for dropping the knowledge bombs!
Best illustration I've seen
Thank you for the video, I have many my friend that they had use the Poliester with EPS!! ahahah đ€Łđ€Ł
Thanks for the upload. Having done Surfboard ding repairs from â86 till around 01, Epoxy started to be used a bit after my time doing repairs.During that time I worked exclusively with P.U. Foam and Polyester resin, M.E.K. Peroxide, Waxed Styrene Surfacing agent. I completely agree with you that the fumes and odour produced by the above mentioned materials is very unpleasant, Very toxic too! and should Only be used in a well ventilated area, also if not properly mixed together to the correct amounts or proportions, the exothermic reaction would be so violent that the resin would begin to smoke up and combust causing a real fire hazard! Although I have no personal experience working with Epoxy Resins and E.P.S. It seems that the best way forward combining the use of P.U. foam and Entropy Epoxy resins and hardener. Thanks đ„đđ€ really looking forward for the completion of you daughterâs mini longboard, love the shape of the spoonbill nose and the pin tail it looks Sick! Iâve got a Takayama Scorpion inspired shape myself, itâs a 6â4â, it has a 10â single fin box + f.c.s.quad fins system too. It can be ridden as a Single fin, a 2+1, or a Quad fin set up.đđ€€
Thanks for weighing in! Yes epoxy and PU is my go to. My daughters board was based off the scorpion model and planning to do a 4 + 1 fin setup đ
@@BendheimBoards Ah Sick! Please do an upload look forward to seeing it đ€đ
You explained this the best out of anyone hands downđđŒ almost ruined my paddle board. I used a styrofoam cup to mix my âBondo fiberglass resinâ before I was planning on putting it on my sup foam board. Luckily it started to dissolve my cup before I put it on my boardđ if it wasnât for my bright idea of styrofoam cup itâd be a diff storyđ worst part is , it doesnât say polyurethane anywhere on it!? Just fiberglass resin!! Almost had home made napalmđ„
next level SFX!
Thank u for your education . I think i know how to determine inggrediens to build kayak . Thank u a lot .
I built a board by gluing three sheets of Loweâs insulation 4âx8x2â, and making some stringers to use a homemade wire cutter. I ended up using poly resin on it and it was eps. I was so bummed when it melted but pressed on anyway. After 5-6 sessions it started taking on water and I would punch to drain and patch again. It lasted me a few months before I used a pu blank and poly resinâŠ..my second board was much better but I did run out of time glassing and had to overcome bubbles. Getting ready for another one. Thx.
Dang man, that's a tough learning experience and I feel you with how much work probably went into it. Thanks for sharing.
Maybe could be cool to use this problem as an advantage, is a pretty cool efect
How? It weakens the integrity of the board. Nahhhh.
I found this out the hard way... luckily only melted a bit which was fixable while glassing my foamie
People have been using thinned out spackle on EPS for many years on Oahu, to smooth them out for painting etc and fewer bubbles.
Give it a shot if you haven't already.
Thank you very much for your video! Everytime watch it i learn something new. I built just one fish and my choice was PU-epoxy. I completely agree about smell and timing of epoxy. Next surfboards i would like to do eps longboard. I didn't understand the process to paint it.
Is there a tips to have a good visual effect on eps foam? Thanx!!
Paint can be sprayed directly onto the foam or added into the resin during the lamination. This is the same for both types of foam and resin. Most my videos show color in the resin but one of my recent videos is airbrushing the foam blank before glassing
GOOD JOB DO MORE !
So cool
This was epic
Super informative and the visual aids really helped communicate the points. From a performance/functional standpoint, what are the differences in how a board handles and feels with PU v. EPS? Similarly, does the resin have any impact to performance or are the effects mostly cosmetic and ability to work with the resin? I've often heard reference to epoxy boards feeling chattery, and I've experience that myself, but if epoxy is only referring to the resin, does the resin truly have that much affect on how a board feels? I've definitely noticed I prefer how my PU feels: it sits more in the water v. on top of it ("epoxy").
I personally canât tell a major difference in the water. EPS makes the board lighter and more buoyant. Epoxy is stronger and has more flex.
I recently had a hole repair on an EPS board to do and while filing the hole with a mix of epoxy/hardener/QCell my mixture became so hot that it melted the EPS foam. Have you ever experienced this? I followed the mixing instruction and cannot figure why it became hot like thatâŠ
Great vidz btw, thanks for sharing with us.
Just poured a ton of polyester resin to set an fcs plug in eps foam. Kept wondering why it wasn't getting filled. Now I have a nice fiberglass shell, wish I saw your video an hour ago.
Dang! Wonât make the mistake again Iâm sure
@@BendheimBoards ha! Keep the vids coming, great info thanksđ€đœ
Brilliant video and super detailed!
Quick question, can you add a polyester gloss coat after an epoxy hot coat? Get the glossy look of a poly board but with epoxy strength? Hope you're well and keep the videos coming đ€
Never tried it but if your going to add a gloss coat in polyester might as well do the lamination in poly as well. Try searching the swaylocks forums to see if anyone has tried it!
@@BendheimBoards yeah I had a look but I didn't find any concrete answers. I guess I need to suck it and see! I'll update on the comments if it's a success or disaster đ€Ł
Poly doesnât stick to epoxy, meaning there is no chemical bond. However epoxy does stick to poly with a chemical bond.
@@Tom-og1qs so no chance then? And also no such thing as an epoxy gloss coat I guess? just sand and sand and hopefully get a good finish eventually.
@@jakecrumbleful so I think if you want a high gloss finish maybe the super clear art epoxy resin will do the trick. It is super clear because of a blue additive, has UV blocker in it and is self leveling. I used it to finish of a acrylic painting of my wife and it looks like a mirror. Pretty fancy stuff. After I used it to clear coat a wooden Paipo and it shines âš
Just my two cents. Enjoy!!
EPS and epoxy for me. EPS because I can get big blocks locally to avoid shipping blanks long distances. Even if I did PU I'd still use epoxy, there's more advantages to it for me. But if the board floats, won't fall apart fast and catches waves then I'm happy.
I'm sold on epoxy as well. I'm lucky to have so many local suppliers here in CA. Thanks for weighing in!
Thank you so much for your video it helped me not to destroy my pu board
Glad to hear it!
Repaired a EPS firewire spitfire with some leftover poly resin I had (Repair from where my elbow went deep into the board).
About 4 months later, my board was rattling and I cut open the top layer of resin to find the foam inside all shrivelled up like voldermort. Had to redo the repair which was now so much worse.
Dang man what a bummer!
My man stirred with a caliper
Reminds me when I use xps foam and tried super glue to hold some stuff together the glue ate right through and didn't stop u til it dried
Imprsevly amazing.
Dude lots of work on that intro...very cool đ€đđ
XPS for the win đ€
Doesnât get much better than this.
Can you make a pin tail gun surfboard I would like to see you make one. And I would be very interested to see the paint job on it and the run through on making one
Thanks for the suggestion
I made this mistake ONCE. It's how I learned my Bing was EPS foam. An M&m sized ding turned into a golf ball sized ding after repairing it. The whole time I was wondering why it was never hardening.
you'll never make the mistake again!
Awesome intro!
Thanks!
Thanks for the video. What if poly resin is accidentally used on eps foam and eats several inches of foam away, can that space be filled with epoxy resin? tyvmia
im going to be glassing a surfboard soon that i shaped. Do you have any videos that go into detail with everything that i need to know?
Try Andrew W, he does detailed videos on that.
Letâs see some barrier cream
Also I have tried using some 3D printing resin as a barrier. It gets hot as the uv hits it so it will melt if you put it out in direct sunlight.
Thanks for the videos man
You bet!
Yeah made that mistake and thankfully it didnât do any big damage. I just had a larger cavity that I filled with epoxy resin đ
Good way to get rid of your scrap eps is place it in some acetone and watch it disappear đŹ
Eps/epoxy in clean waves
PU/PE in everything else
I've wondered if you could make a fin core with the melted stuff. I've seen people sculpt it like clay then let it harden. But I could never get the acetone/eps mixture to dry out enough.
haha never tried that experiment, next time!
That would be interesting to see man, do it!
@@WaveWasters yeh it takes forever and a day to dry. And even then you think itâs dry and itâs still wet inside. But I have heard of people mixing it with hdpe and it becoming bulletproof
@@Shrednaught I'll have to look into mixing it with HDPE. I've been playing around with HDPE fin tab molds for over a year now so might be a way to use up shavings of that too.
I had an experience with EPS foam and epoxy resin mixed with Q cell to fill a void for a fin box replacement. The topping pour dissolved the foam and just disappeared into the core of the board. Too hot of a batch? I thought the part A and B mixing was solid but maybe not. Thoughts?
Thats odd. You could be right, if its a really thick amount of epoxy resin it will get super hot. Haven't had that issue before. If it was a large cavity, next time fill it with a scrap piece of foam and then seal with the resin to use less.
what would happen in the situation when repairing a surfboard with pu foam and epoxy resin. would a repair be able to be done with polyester resin? great video btw
You should match the same resin that was originally used. But if you didn't have that option, I'd feel comfortable using an epoxy patch on a board with Polyester resin. Never tried polyester resin on a epoxy/PU board. It might work but can't speak from experience.
@@BendheimBoards thanks very much for your helpđ
What do you think about Eps foam, epoxy resin and fiberglass laminated, then polyester resin glassed?
I wouldnât suggest mixing different resins on different stages. Could make bonding issues. Epoxy could be used on a poly board for a ding repair if your in a pinch but I wouldnât put poly resin on an epoxy board
Great video. Just wondering, is it okay / standard to use fibreglass cloth between EPS foam and Epoxy resin?
Yes fiberglass cloth gives it the strength
@@BendheimBoards Thanks man!
If all you were doing was trying to achieve that glassy look, do you need the fiberglass or can you just add resin?
i want to make a skimboard.
what would u use fore that actually?
My kids have boogie boards that they just bought the brand new and I thought it would be cool to put epoxy resin finish on them for durability.
Does anyone have any thoughts on this?
I'm going to assume they're made out of eps and they're covered with some kind of fabric.
Imagine repairing broken boards through melting them together đ
I think some people paint the foam using the paint as a protecting layer and they can get away with not melting the foam.
Would XPS foam react simlarly to the EPS foam? Thanks.
I wish I could make my own board
I made a huge hole on my board using PU resin. Worst way to learn my board is EPS. What do I do now? Any videos on repairing big holes ?
Some say you can laminate with Epoxy and the hot coat with Ployester resin, what are your thoughts, thanks.....
Iâve heard people doing this but I wouldnât. Better to use the same resins in my opinion
Hi
I want to build a electric surfboard with EPS foam but don't know what epoxy resin should I use because there are a lot of different epoxy resin. Could you please tell me which epoxy resin should I use?
Use Greenlightâs marine grade epoxy
Hey there again. When I use epoxy for my hotcoat, I got pits and even crates on the board. Is this because off dust or humidity or something else? I did test some pieces degreasing with motip degreaser, eco aceton, alcohol, st-marc soap (also degreaser) etc.... My last 3 boards had this problem but I still don't have a solution or case... I would like to sent an image but I don't know how. Could you help me pls?
Grtz Steven
Luckily I haven't had this problem but I've always been very careful about not letting any debris on the board during the glassing process and wearing gloves so the oils from my hands don't get on it. I clean the board with denatured alcohol before doing the fill coat. My epoxy resin is greenlight surf supply's brand. That's my process, not sure that helps.
Can you use lightweight filler to fill the eps blanks ?
Greenlight sells filler you can buy. I think spakel can be used as well but Iâd test it first
What kind of epoxy resin can I use for EPS?
I ask because I think you use a fast hardener. May be I can use all class of epoxy resins for EPS foam. IÂŽm not sure. Where could I buy it?- In Europe we donÂŽt have Greenlight epoxy resin
Thanks in advance from Spain
When I was 14 I tried to fix my eps board with poly resin. Sunk a hole all the way through to the other fiberglass.
For your eps blanks do you have a code with greenlight that I could use as a referral for ya?
Yes! Use the link in my video description and then find the blank and purchase and itâll give me a small commission. Thanks for the support!
5:10 Anyone know how to "seal the foam blank" for the texture of the eps blank not to show?
What do you seal the foam with ?
I have a styrofoam blank that I want to glass over and don't know how to seal it ...
Watch my surfboard building videos. Fiberglass lamination then hot coat
also E over P only.
at 6:12 that would look sick as a real board, if you can make a board like that with epoxy over it, that would look so sick.
It is a cool effect, but would be hard to translate to a board. Probably have to fill al those areas with epoxy resin which would add a lot of weight. Maybe a wall decoration board!
What about XPS foam?
Just wanted to stick with the most common in the industry, XPS can be used as well but not very common.
i would argue against pu foam with epoxy resin as well... i repaired some boards already with that combination and there's something not working well in my opinion , it seams to delaminated much easier and make for bigger and messier dings...
but i will admit... could be a wrong perception of mine ...
What type of 3m Cartridges does your facemask have? 6001, 6006, etc?
6001
Its crazy all eps foam is is styrene and water
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Damn, I just made this mistake like 10 minutes ago on a surfboard repair.
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The satart so fani
EPS makes boards too light. I remember when I made my first board (and so far only time) with EPS and epoxy. The result was a very very light board, hard to stand on it. I thought it was my problem. Recently, I bought a foamy for summer and again. EPS. too light and unstable. I'm going to glass it one day with epoxy (thanks for showing the wonderful mess it makes poly on EPS) but I guess it will end up as light and soft as my first self made board: a piece of expensive decoration
Just use more glass.
What kind of epoxy resin did you used? WhatÂŽs better and worse?
@@enriquegomez-ceballosgoya7142 Common epoxy. If I remember, there's epoxy for surfboards that doesn't yellow, and normal for construction epoxy that yellows.
@@ivydune4185 Simply clever answer. Many Thanks
HiÂĄ I proved epoxy resin with slow hardener and my results were, that after 3 days the resin ate the EPS, but not too much.
Why does the foam melt? Just melted out my fin box while trying to do a small fix. Nightmare
Too much catalyst?
EPS foam is not compatible with polyester resin. You have to use polyurethane foam with poly resin
Realize well that epoxy contains quite toxic components that may cause bad allergic reactions. Be aware!
Do you get the same fumes as pu resin if you don't get the smell using epoxy resin?