Been perusing swayers for a simple answer.
Can I use polyester resin on my EPS blank following 2 layers on the bottom and one on top of epoxy. more for coas, time and simplicity to obtain PU. The board is sealed in epoxy laminate. Im going to do my graphics before laying another 2 6oz on top with PU. The PU resin will be kept off the foam. Should work yes or no?
Ta
You just need to make sure the poly resin doesn’t get in contact with the EPS and all is good.
thought so.
will a good layer of accrlic paint protect the foam just as good - im thinking for forther projects using EPS and then doing my graphics onto the foam and the glassinf in PU resin - if the paint job fully seals the foam it should be just as good a barrier?
Have an abundance of PS on my hands and have a quiver just turning over each night as i try and sleep
when i was at design/art school we use to play around with eps we found that you could coat the eps with cross linked pva or normal pva then put what ever over it. we use to slightly water the pva down so you could roll on an even coat only a little water. i think you need to do two or three coats. You would have to do the old test panels. Oh glue needs to be totally dry not just tough dry.
just a sugestion
interesting. well worth an experiment.
So find a good PVA glue and paint it and set. PU resin should form a good bond with that imagine.
Let the experiments roll on...
I'm not saying you can't do it......Did you read up on the new Resin Research stuff???
Mixing the two resins is a waste of time in my world........Go for it....Post your results here....And post your results after One year of hard core surfing....poly and epoxy are not friends...
Ray
hi, this comes up time and again ,once set and properly hard the only way epoxy sticks to the epoxy laminate is by sanding a rough key ,its only the mechanical key that sticks epoxy to epoxy,
people still have trouble sticking epoxy to epoxy for this reason,
so if you leave the epoxy laminate to fully harden and give it a good key with 80 grit by hand polyester will stick just as well because it is sticking to the key ,
i have done quite a few this way with no problems at all , pete
You mean polyester when you type PU? PU is short for polyurethane not for polyester. I’m saying this because PU-resin also exists, I was confused by your post in the beginning.
Hans
Yes hans.
Thanks for the pull up - i was getting confused.
why not use epoxy the entire way? you’re already using it, why add poly to the mix? it will work but, you will have bonding issues without a doubt, and the first time the board is dinged, bye bye hotcoat! tried to shortcut a few boards in the early days with suncure hotcoats, sanded great but never lasted, just use resin research and save the headache
It won't work. You will delam, your board will blow up., and you'll poke your eye out. If it was a poster or something that was going to be hung up...well baybe, but were talking about something your going to be stomping on.
You can put epoxy over Poly, but you can't put poly over epoxy. Also if you use resin research epoxy you can laminate epoxy to epoxy anytime, you don't need to scratch or key the surface.
Also there is no good way to seal/prep a eps blank to cover in poly resin. Your on track to make a POS surfboard.
I Tried it. Sealed eps, painted the blank, Laminated with epoxy, hot coated with poly. The poly leaked through tiny pinholes in the laminate. If you hold the board up to the light you can see where the foam melted under the glass. Board worked for a while but failed sooner than it should have otherwise. Oh yeah, and the poly hotcoat began to chip off.
yes you can use polyester over epoxy very easily. but it will go through pinholes and melt eps. over wood or poly u its fine. epxy must be fully cured and keyed surface for a fill coat . a sanded finish is all required for a a gloss. it looks really good for gloss coat. some epoxys will not allow for a poyester over the top so you will need to test it. kinetics resin is fine . other brands and the polyester resin doesnt cure. you can do a myriad of combinations doing bottoms in epoxy . tops in poly . for example you could do a clear lam of epoxy and then another lam of poly over the top with a resin swirl etc etc . possibilites are endless
Poly hot coats will peel off within a year in about 20% of the boards .... two years about 50% .... three years about 75%. Many boards don't last this long anyway but many do. Average poly/pu lasts about 100 hours. EPS epoxy lasts double that. So I'd say it's ok if your not selling the boards. But at this point, why? New epoxy is just as fast as poly .... even faster when it's above 80F. And hot coats of epoxy make a significantly stronger board.
when you say 75% peel off greg . do you mean the whole fill coat or just areas where they are damaged. or does the whole thing flake of like in sheet?
. when you say why use it . i can only answer that there is plenty of reasons to do it . colour work for one. hybrid cores. fun. its cheaper.it looks better. it smells better. UV cures are sandable in a short time. or just why not use it.