by Mike - Alumilite » Mon Apr 02, 2012 10:02 am
It sounds like you sprayed it with plenty of UMR. Sometimes what happens is the rubber seeps down the edge of the mold box a little and it is difficult to get it started. One trick to get it to start releasing is to cut a corner of the mold off on a 45 degree angle. Make sure part is not in the corner. Then start separating right from the cut line. Sometimes you can see the seam due to a ever so slight color difference in the mold. Think of it this way ... if you sprayed release, the two halves can not bond, you are just trying to find that miniscule seam line in a block of rubber and if the outside edges are locked together, we now have to find a line that is sealed at the edges.
This happens quite a bit and the trick is to keep working around the part until you can find the seam line. Don't try to cut down the seam horizontally as it is almost impossible to find but rather cut down vertically through both halves of the mold and then try separating the mold halves. Be patient and don't get too rough with it. As soon as it starts to separate, the whole thing will come apart without an issue but you may find it tends to stick around the very outside edge.
Hope you haven't started slicin it up yet trying cut your piece out. Please call me if you have any questions.
Mike
Alumilite
800 447-9344