Thank a lots everyone, I finally received my carbon firbra it look cute.

I need other help.

My question is what is the best product to coat the polyerster foam before applying epoxy. I want some thing that can grip the polyerster like the car's body work plaster

Iam not one for giving advice,but I would suggest some people read the basics of understanding epoxys and polyester resins and the difference in the way they work regarding catalyst mixing,shrinkage rates and applications,I think before using carbon and the cost of the materials,I would recommend a book from blue gee,most off it is basic but very understanding for a novice.

It's a slight subtle difference in the chemistry.  It is worth people understanding.  With a catalyst based reaction, you can to an extent control pot life/cure times by varying the catalyst quantity (subject to adding the minimum obviously).

Where as with a non-catalyst based resin such as epoxy, varying the quantities of "hardener" or "part B" won't speed up the cure, it will just leave you with uncured resin in the laminate.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

yes you are correct..i was confused.LOL it happens. in either case each needs to be fully mixed

CarbonFiberCreations

Thank you all for your help and infomations... I have just posted an image below I think this is the  two coponents I need to make my prototype product skin. if anybody have a doubt please let me know because you guys have been a life saver

A polyester resin contains all the componants needed to make the finished solid plastic.  However it wont react on its own to polymerise, it is also a thermosetting plastic. The adding of the catalyst MEKP promotes the exothermic reaction that causes the chain linking to begin resulting in a solid plastic.

Epoxy resins come in two seperate componants. No catalysts are needed.  The two componants when mixed will react with each other to crosslink and polymerise into a solid plastic.

i have a piece i cast that was not fully mixed...a year and a half and it is ok to handle but if it gets warm it gets soft and pliable.
for CF that is a FAIL and a huge waste of money and time.
yes mix like a madman and double cup and new stick it.

CarbonFiberCreations

I go so far in mixing that I always double cup just to make sure its thoroughly mixed. By that I mean, I mix thoroughly in one cup and then pour the mix into another clean cup and continue mixing with a new stick. Why you might ask? I have got burn't  with polyester gelcoat not being mixed thoroughly. The result is what I call cancer (crocodile skin, wrinkles etc)
Epoxy is so expensive I feel it worth the added insurance of a complete mix.
Hope this helps.
Fred

both need hardener.
MEKP is the hardener added to the ratio required for each resin.  each resin will have instructions  for what the hardener amount is .

CarbonFiberCreations

You are talking about two rasin here right, polyester and epoxy?
what I understood, Polyester dosen't need catalyst hardener and Epoxy does. Do you mean that Epoxy need 5% of hardener by weight?


cheers

Dei