Hey guys, hoping someone can lend a bit of advice on this.
I'm currently molding a couple of pieces for some more Portal stuff, and I'm running into a real pain in the ass problem. I have a puck that looks very similar to this:
This is a shot from my Daft Punk build, but the shape and size are very similar. The piece is made out of MDF, and there is an ABS disc in the center that adds some detail (it also covers the hole from my lathe that you see above.) On top of that are a few coats of Rustoleum gray primer which has been sanded smooth with 000 steel wool. After this I went over the piece with 50/50 water and windex and wet sanded with 1000 grit, then let dry overnight.
I've poured the silicone for this three times now, and twice I've ended up with silicone that has not cured in the center of the puck (recessed area above) This is where the ABS is on the actual piece, but I can't see how that would be an issue seeing as how it is coated in the same primer the rest of the piece is covered in. This isn't the thickest area of silicone either, but it is one of them.
On the first pass I let it dry for 18 hours. Pass 2 dried for 12 hours. Both did not cure fully in the middle and were still very gooey when I pulled the mold open - but again this was only in the center area where the ABS disc sits. I'm currently on mold #3, which has been curing since 8pm yesterday evening. I'll be opening that one at 8pm today to see if this is a time issue, but on the chance that it isn't, does anyone have any advice on this? I'd really rather not waste any more silicone trying to mold this thing any more if I can avoid it.
Thanks in advance!
I'm currently molding a couple of pieces for some more Portal stuff, and I'm running into a real pain in the ass problem. I have a puck that looks very similar to this:
This is a shot from my Daft Punk build, but the shape and size are very similar. The piece is made out of MDF, and there is an ABS disc in the center that adds some detail (it also covers the hole from my lathe that you see above.) On top of that are a few coats of Rustoleum gray primer which has been sanded smooth with 000 steel wool. After this I went over the piece with 50/50 water and windex and wet sanded with 1000 grit, then let dry overnight.
I've poured the silicone for this three times now, and twice I've ended up with silicone that has not cured in the center of the puck (recessed area above) This is where the ABS is on the actual piece, but I can't see how that would be an issue seeing as how it is coated in the same primer the rest of the piece is covered in. This isn't the thickest area of silicone either, but it is one of them.
On the first pass I let it dry for 18 hours. Pass 2 dried for 12 hours. Both did not cure fully in the middle and were still very gooey when I pulled the mold open - but again this was only in the center area where the ABS disc sits. I'm currently on mold #3, which has been curing since 8pm yesterday evening. I'll be opening that one at 8pm today to see if this is a time issue, but on the chance that it isn't, does anyone have any advice on this? I'd really rather not waste any more silicone trying to mold this thing any more if I can avoid it.
Thanks in advance!