casting rubber

[jabell]

I couldn't find a sub-forum better suited to this topic, so feel free to shift it.

Has anyone any experience with casting rubber? Long and short of it is 2 weeks ago I laid some concrete for a path, and once done I went in for lunch not noticing the cat went out when I went in
A few days later the cat attacked a brown snake, and not surprisingly said snake defended itself. Both died We've had the cat since my daughter was 8 years old, and now 24, being most of her life, and she wants a cast of the cats' footprint before I pave over it with sandstone.

Googled the topic, and there seems to be an endless choice, but what I can't elicit is what would be suitable for taking a paw print from concrete. And just to show off, I got all arty-farty with an 8" angle grinder and a diamond blade to whittle one of the stones down to a map of Oz!
OzRock.jpg

[Big Shed]

Look up Barnes for silicone rubber

Barnes Products - Silicone Rubber. All your silicone needs. (2) - Barnes Products

[China]

Contact this mob Adelaide Moulding & Casting Supplies

[jabell]

Contact this mob Adelaide Moulding & Casting Supplies

Looks like a product called Pinkysil Putty is the answer, at $23.
Here Pinkysil® Putty - 200gm [SR-PP-T] - $23.50 : Adelaide Moulding & Casting Supplies

There is even a Youtube video about it https://www.youtube.com/watch?v=dmXwFrvLXVk

[joe greiner]

I've used high-temperature silicone sealant to make flexible molds for lead casting - typically used at fireplace vents. Ordinary silicone sealant would work for concrete casting.

I make the molds against a plaster of Paris pattern, with water-soluble hand lotion as mold release. Spread the sealant about 6mm thick with no regard for smoothing the back. When cured (overnight sufficient), encase it with a plaster shell for rigidity.

One tube of sealant should cost less than $10 last time I checked.

Cheers,
Joe

[jabell]

I've used high-temperature silicone sealant to make flexible molds for lead casting - typically used at fireplace vents. Ordinary silicone sealant would work for concrete casting.

I make the molds against a plaster of Paris pattern, with water-soluble hand lotion as mold release. Spread the sealant about 6mm thick with no regard for smoothing the back. When cured (overnight sufficient), encase it with a plaster shell for rigidity.

One tube of sealant should cost less than $10 last time I checked.
Cheers,
Joe

Very clever - hadn't thought of plain old silicon.

[ubeaut]

If it's of any help we have a couple of rubber moulding mobs who buy our Talcum Powder as a release agent for their moulds.

Cheers - Neil