Hey guys, I'm in the process of making a silicone mold of my large lap tray prototype. I've been getting some advice from the guys over at Smooth-On but unfortunately I've gone through 2 trial and errors ($$) and could really use some advice as I'm out of ideas and not keen on spending more money on guesses.
The problem: Demolding my brush-on silicone is pie of course because it's super flexible. The issue is the mother mold. Previously I've tried a rigid foam and a paint-on plasticóBecause they're such ridged material, and the tray is flat on the bottom, there is nothing to get leverage on to separate the two. (Pulling them appart does not work because the tray has so many crevices [see attached photos] and the mother mold material gets in there so snug)
My question: Does anyone have a recommendation for how to circumvent this demolding issue? I was thinking of biting the bullet and paying the $2000+ to make a poured silicone moldóMy thinking is that the silicone will be strong enough to keep the form of the tray, but flexible enough to "peel off" for demolding.
Second train of thought was maybe there might be a soft foam I could use that again would be sturdy enough to hold up the walls of my paint-on silicone mold, but squishy enough to grab it and pull it out of the crevices of the tray.
If anyone has advice on these ideas, or a completely different idea, I would REALLY appreciate it! I've been banging my head against a brick wall for far too long and it's driving me crazy!
Photo #1 - prototype
Photo #2 - paint-on mold over prototype
Photo #3 - paint-on mold without a mother mold
Photo #4 - the prototype/model in the mold, nothing to get a hold of to wiggle it out of the mold
Photo #5 - need to have something that allows me to get my hands under the mold to extract the model
Thanks again guys!