Hey there, I'm working on my first sculpt and have run into a few things I have questions about.
I'm working on making a Deatheater mask from Harry Potter. I used tinfoil to take a negative impression of my face, then poured plaster of paris into it (so that I could have a good base to work off of - like I saw in SpaceCowboy's http://www.therpf.com/f62/pota-inspi...-masks-144349/ post.
I made sure to wipe as much of the vaseline off as I could before sanding, and waited until the mask was cool to the touch (5 hrs, and I allowed it to sit in the sun to help it cure) before starting to sand. But as soon as I started sanding, I noticed the pad on my sander was coated in an almost wet layer of plaster.
I'm wondering if I should have left it to cure longer or if the vibration from the sander (it's one of those Corner Cat detail power sander things) re-liquified the plaster somehow? Has anyone run into this before? I got it smooth and then set it back out in the sun in hopes it would dry out some more, because I don't want to start sculpting on top of it while it's still feeling damp.
Second, I was wondering if when using clay (either Super Sculpey or Chavant NSP, I haven't settled on one yet) it was necessary to seal the plaster with like, a coat of primer or something, or can I just put the clay right onto the plaster?
I eventually want to do a silicone mold and do resin pulls, if that helps...I'm just wondering what is up with the plaster? Any ideas or tips and tricks? I'd appreciate it a lot. Thanks everyone...