Okay so I just completed my first mold and everything looked perfect...from the outside. As I pulled the part from the mold I noticed the part had been completely alligatored through the OEM paint and into the abs plastic part itself.

What caused this?! I didnt use too much MEKP I actually used a little less than I was supposed to. I waxed and PVA'd several times while useing the proper precautions of waiting to dry in between coats. The only thing I didnt use that could have been a causing factor is a hi-temp wax. I actually left it at home so I used Honeycomb wax or HoneyBee wax..something like that. It comes in a yellow container.

I will be producing more molds from plastic parts and dont want this to happen again.

Thanks for the help!

Hi,

It happened exactly the same to me, when i´ve done the mould of my bonnet, the paint went damage.

I have another bonnet mould to do and i´m affraid that happens the same.

With the Uni-Mould Vinylester Tooling Gelcoat it dosen´t happen?

Pedro

It shouldn't happen. Use Chemical Release Agent and Mould Release Wax (several coats of chemical release agent followed by several coats of mould release wax). Ensure that you have a good level of catalyst in the tooling gelcoat (2%) and that it's not too cool/cold where you're working at it should be fine. As you can see from our video the bonnet we took a mould from was undamaged. If in doubt, do a test on the inside first.

--Matt

Matt Statham
Easy Composites / Carbon Mods - Technical Sales