Perry said "I figure if I put one of those super super thin plastic wastebasket liners the kind that would be in offices,"
I had to put some brick forms on ground that was not sand but grass and leaves, and I will tell you that even though the bricks are not that even, and don't need wire mesh to hold stucco, they take impressions very well. I have some perfectly preserved leaf and grass blade impressions in brick. That will keep the paleo-geologists scratching their heads in 1000 years!
If your project is small (molding PC) you may want to try some hairspray. When I was younger I built a number of white water kayaks and to get the deck and hull to separate from the mold I first waxed the mold with Johnson&Johnson paste wax (no buffing so it was fully covered), and then a liberal coat of hairspray. I did actually use hairspray once when I ran out of what I actually used which was the industrial equivalent of hairspray. They were identical only with the industrial stuff you weren't paying extra for the smell and small pressurized can.
Using even a "super thin plastic garbage " leave crease marks on any compound curve. If this is not a problem then cancel all the above.
Ron
I had to put some brick forms on ground that was not sand but grass and leaves, and I will tell you that even though the bricks are not that even, and don't need wire mesh to hold stucco, they take impressions very well. I have some perfectly preserved leaf and grass blade impressions in brick. That will keep the paleo-geologists scratching their heads in 1000 years!
If your project is small (molding PC) you may want to try some hairspray. When I was younger I built a number of white water kayaks and to get the deck and hull to separate from the mold I first waxed the mold with Johnson&Johnson paste wax (no buffing so it was fully covered), and then a liberal coat of hairspray. I did actually use hairspray once when I ran out of what I actually used which was the industrial equivalent of hairspray. They were identical only with the industrial stuff you weren't paying extra for the smell and small pressurized can.
Using even a "super thin plastic garbage " leave crease marks on any compound curve. If this is not a problem then cancel all the above.
Ron
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