they call it Epoly I believe.
* no hipster beards ( allows small particles through )
Scrub it kook
I was posting Epoxy over Poly buids on here a decade or more ago.
Good point made by McDing in the OP and something that bears reminding the rest of us of -> +1.
Come to think of it, it's something the general surfing population could probably bear reminding of too; don't see too many Epoxy over PU blanks being offered off-the-rack and a more durable board does help make for a little less polluted world.
Good comments and info by others too along the course of this thread, and in particular +1 to Doc for his; I think I recall in one of Bert Burgers threads from year ago he made the statement that PU blanks contain small amounts of cyanide in the foam cells and that as you shape it you're liberating tiny amounts of that cyanide into the air around you; something you may be able to get away with as a once-every-so-often DIY backyard shaper, but in a production environment the accumulative odds are ones I wouldn't like to be taking. So rug up with what you need to get the protection you need -> 'onya doc :)
Hmmm- you got me interested regarding polyurethane and cyanide. And in that interest, well, I used to work for a fire science HAZMAT chemistry expert in college, as sort of a lab TA, I looked it up.
Okay, polyurethane in and of itself doesn't contain cyanide, particularly the very toxic hydrogen cyanide. It does contain the building blocks to make it, carbon, nitrogen and hydrogen. Now, if you decompose polyurethane, say set it on fire, yeah, toxic levels of HCN plus the ever popular carbon monoxide. Known hazard in the firefighting business.
So, don't cook over a campfire made of foam scraps, right? Especially indoors? Well, yeah, but if your tools are dull, planer blades or sandpaper for instance, you'll be burning a little foam. Not much, most will be chopped off even by something dull. And you'll be making cyanide, but not much. Probably where the idea comes from of cyanide being produced when you work polyurethane foam.
Thing is, there's cyanides in a lot of things.Fruit pits, flax seed, cassava treated wrong. The body breaks it down as long as you don't have repetitive exposures . But still, best to mask up while shaping or working with foam, the dust itself does plenty of bad things when inhaled.
hope that's of use
Might not want to hot wire PU foam -- cyanide release with thermal decomposition.
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
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Couple of thoughts from my experience with Epoxy over Poliurethane both making boards and from my son riding boards made using this method from a big name company.
1. The boards dent rather than shatter. This has plusses and minuses. Poliurethane foam does not rebound from an impact the way EPS does so when there is impact with your E/P board the foam compresses and just stays there where an E/EPS board the same impact may rebound and not leave a dent at all or the dent may be less substantial. On team light E/P boards I've even notice that they get what I'll call finger dents from where my son will grab the board firmly while in the water.
2. While epoxy resins have improved dramatically in this regard, they still discolor very quickly. Again, nothing like the boards of the past but still not something I would want happening if I was a retailer. Epoxy glassed boards that have been on the rack for a while stand out like a sore thumb near fresh PU/PE boards. Also it becomes quite noticable if a board gets stickered up and then the stickers pulled off. I know that's kids stuff but I've got one of those and when he pulls his sponsor stickers off of his epoxy glassed boards to sell the board or to just put fresh stickers on its glaring at you even if the board has only been in use a couple of months. Again this is nothing like how badly epoxies of 10 years ago turned amber but still something to keep in mind.
3. There is no way around it, doing proper repairs to a board glassed with epoxy is just a pain in the ballz. Extra prep and extra time to get the board back in the water. Yes there are UV epoxies now for repairs but I've found them to be miserable to work with and best suited for a quick patch approach. I'd rather do repairs to PU/PE boards any day of the week. I do repairs for friends and kids in the neighborhood and when friends ask me to do repairs to their epoxy glassed boards I tell them to take that one to a local shop for repair. I just don't even want to bother.
I acknowledge your EpoxyPoly builds and your statements above regarding durability. Your three points above confirm what I have always said ; EPS springs back to rockerbetter than Poly, but EPS is more likely to snap at a certain stress level. Whereas Poly will go farther under stress, but does not spring back as well as EPS. So with Poly creases and buckles are more likely. A lot of new people around Sways these days. Just a reminder that a Poly core with an Epoxy skin is a solid combo. Not as smelly either. Especially when you are new to glassing and doing it in your apartment or garage and your wife has a sensitive nose. Lowel
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