By shaas8 - 11/9/2012 3:56:28 AM
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!
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By Matt (Staff) - 11/13/2012 10:14:35 AM
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
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