Well, that’s a test I seldom put my boards through, being as how I’m mostly a dawn patrol guy, paddle out at 6 and by 7:30 or 8 I’m off to work or other things. But intuitively I feel the issue is related not only to heat, but also to it being a recently completed board. I could be wrong, but I feel that epoxy that has cured over time is much less likely to bubble and de-lam than a freshly glassed board. Maybe others could comment if there is any truth to that.
I know most the problems I’ve had have occurred on freshly glassed boards, seems like after a certain time threshold, I no longer have or worry about those kind of issues. But I do try to keep my boards out of sustained direct sunlight when not in use, I bungee a painter’s tarp over them when strapped on the roof (board bag or not).
I feel like for my health, and my board’s health, prolonged heat and UV exposure is not a good thing.
Yes after long time curing, epoxy tg, limit temp of softness, is higher. Increase tg is the main purpose of post curing. I had delam with light “bad” eps foam, now i use good quality 2lb foam and post cure, no more problems.
I’ve had similar delams to Ray’s recent heartbreaker - using epoxy over poly blank, with dark pigment + sunlight. No paint, no air in the lam. Just a lot of heat.
Here is an old post by Greg Loehr from back in 2007: “One other note worth point. I have glass several polyeurathane boards with R.R. epoxy and find that they are very sensitive to heat. By this I mean that even when they are post cured for a couple hours at 120 degrees over at Stretch’s factory, (R.R. is what he uses for all of his composite construction) I find that if the board is left in direct sun and allowed to heat up the foam will shrink and the epoxy will move with it and hold the shape that the foam has shrunken to; a most unfortunate circumstance I’m sure you’ll agree. As a result I’m very careful these days about transporting and storage of these sticks.”
haha! Just had the green waste water treatment happen to me with a vengeance today! Took my board out for its maiden surf, and strapped it on top of my truck after. Kept it covered with a tarp as per my usual, but the tarp doesn’t reach the very tail. It turned green! On the tail patch, which was colored with tint in the resin (most of the board is painted). Good thing its my own board, it does look kinda weird, and I guess it’ll only get worse with time. Oh well. RR Kwik Kick, first time it ever happened to me.
I have a photo but can’t embed it from this goofy computer I’m using. I’ll embed it later when I get on my own computer, but here’s the link for now.
Unlucky Huck, especially on its maiden voyage. I originally put it down to something I did, now not so sure… You have any thoughts as why it happened to you? Be great to figure out how to avoid this. I’m sure pro glassers couldn’t put up with this happening too long!
hard to say without sanding it a little, but does it look like in the HC or lam? I suspected HC on my buddies.
Polyurthane blanks turn yellow. Resin companies take the heat. Skin a poly blank. Put in the sun for a few hours. Take it inside for a few days…compare it to a new blank. It will be yellow. Do the same with an EPS blank and you might be suprised how “white” the EPS will stay…If you are using RR KK PH… yellowing will be the blank not the resin…and they all yellow sooner or later so stop your cry’n.
My problems are direct sunlight and heat for a prolonged time and stuff we all need to read and re-read from PeteC…Kinda cool that I figured out where my tests went haywire…When Resinhead and I get together at Big Sur in a few weeks he’s gona smack me on the head a few times…for stupid stuff…I almost pulled off somrthing…maybe next time…or maybe just go back to boring clear surfboards…
I never completed my tests and I’m not sure when I can risk another delam…back in the olden days surfboards did not have insulated bags and over protective owners. Resin Research is an awesome product.
Back to the beach…see you soon…Stingray…watch your step