Gallery, Projects and General > How do I??

Concrete form

<< < (4/4)

vtsteam:
Tallow is the traditional concrete (not modern chemical) release agent. It's a grease so it stays put rather than mixing with and floating in the mix, and apparently also chemically produces a better cure and release. You can either buy it or easily make it by rendering animal fat in boiling water, skimming off the foam/impurities, and then ladeling into a tin can. Bacon grease works. Boiling takes out the salt and tissue impurities. Tallow is traditionally used on shackles on chain  rodes in salt water for moorings and anchor tackle to prevent corrosion in the threads. You can unscrew them after a year of immersion. Oil doesn't work at all for that.

Not sayin' salad oil won't work on wood forms, I'm sure it will. Just if you want the old time best material for the purpose, it's available everywhere and basically free.

Navigation

[0] Message Index

[*] Previous page