Having done multiple samples on both Acrylic and polycarbonate mould surfaces, I have still am not getting any satisfactory results with the GC50 polyester gelcoat.

MEKP catalyst is MEKP catalyst, doesn't matter what brand it is.

Thanks for the reply. I'm pretty sure that the catalyst was at fault. I kept the pot I mixed it in and it cured cloudy and and not fully hard. I realised it was a couple of years old.

24 hours is really not long enough i think. Got the same problem,  just did my first 2 resin infusions, they both failed because i think i removed it to early.

Not sure but is it possible there was a lot of temperature build up with the polyester by it's chemical reaction while curing, causing the PC-mould to go to a meltpoint melting together with the polyester? If i where you I would try the same process for a testsample on an aluminiumplate to see if the problem is caused by the mouldsurface you or working on or the resins/releaseagents you are using

Matthieu Libeert
Founder MAT2 Composites X Sports
website: www.mat2composites.com

Hi Guys,

I have just completed a resin infusion using your infusion epoxy resin. My mould is a gloss finish polycarbonate sheet. I applied several coats of easylease (per instructions) to the mould, followed by a brush applied coat of your GC50 Epoxy compatible gelcoat, followed 3 hours later by resin infused carbon reinforcement.

Unfortunately, 24 hours later, the part was stuck fast to the mould. When I removed it (with much force!) the carbon laminate came away from the gelcoat while leaving the gelcoat stuck to the mould surface.

I am trying to establish why this happened. I did use a standard MEKP catalyst with the GC50, not your catalyst product as shipping restrictions would allow me to purchase it with the gelcoat (I'm in Ireland). Is it possible that the MEKP I used was incompatible or past it's shelf life? Or could it have been a reaction of the easylease with the polycarbonate.

Your advise would be appreciated.

Wesley