Post #35356 by thebaxdog on Thu, May 22, 2003 8:07 AM

Here we go kiddies
Right, the so called molds I have used are party decorations and are very flim-Z.
So first I turned them over in the garage built a frame to hold them down and poured what I would call a positive, so that the mold fits into it for support.
Casting plaster is my cheaper way to go and I do mix in all kind of stuff left over from jobs. I have been so flippen busy at home and work I have not poured in like 6 or 9 months.
Never I say NEVER mix in any kind of drywall product, I have lost over 20 masks that just crack up and fall off the wall.
I have used all kinds of release agents
Pam, soap, diesel, but right now I am using the goo that electricians use to pull wire through conduit. When the mold comes out I just rinse with water and it comes off.
Now for molds with a little negative edge, you know that corner that always pulls off when you pull the mold off, WELL tip of the day.
Clean the mold with Laq. thinner (just lightly cause it melts some plastics) and not the whole mold just the area that's a problem. Then use pure silicon caulking in the low spot. Keep some thinner in a little cup next to you to dip your finger into for smoothing. this should fill the low spot and make the mold release easy-er. The silicon done right should last 10 or more pours.
I have tried pure silicon spray as a release also but it works about med.
At Home Depot you can get cement colors to mix in and rub on later. then after all is dry for a couple of days we cover them with a product called The Wet Look.
Casting plaster is hard to find in the big bags, you need to call places that sell rock and block and cement and (oh gosh I am getting all wet) big contractor stuff.
I mix all materials together dry first in a clean bucket then transfer to a mixing bucket and use a big drill and masonry paddle mixer (insert gorilla noise and thump chest at this point)
Hope this helps, E-mail for any more of my bullshit