Quick Rtv Mold Caution!

[COBRA]

just a little fyi. i rushed on lunch today and did up a mold. normal white mainstays silicone, some water, ect, added a skim coat first, then a thicker coat, squeezed non h20 silicone on top sprayed with water no biggie. its been sitting all day. i just pulled it apart and i thought excess water from the mold ran down my hand. nope! it was built up acedic acid or whatever the acid is called in silicone. let me tell you it must have been concentrated cause it burned like hell. i couldnt find any baking soda so lots of water and soap but my hand is still burning a bit. i have been making some pretty large molds as well so maybe thats the case but just be careful. if you peeled off a mold and it sprung that crap could get in your eye. as usual be careful.

[Husky]

just a little fyi. i rushed on lunch today and did up a mold. normal white mainstays silicone, some water, ect, added a skim coat first, then a thicker coat, squeezed non h20 silicone on top sprayed with water no biggie. its been sitting all day. i just pulled it apart and i thought excess water from the mold ran down my hand. nope! it was built up acedic acid or whatever the acid is called in silicone. let me tell you it must have been concentrated cause it burned like hell. i couldnt find any baking soda so lots of water and soap but my hand is still burning a bit. i have been making some pretty large molds as well so maybe thats the case but just be careful. if you peeled off a mold and it sprung that crap could get in your eye. as usual be careful.

Thanks for that heads up. When I make molds that way, any excess water drains off at mixing and that's the last time water touches the mold.

But the acetic odor is the acid evaporating, like it does with vinegar. My guess is the excess water probably trapped and concentrated it.

This one will go into the Hammer Mechanic's Handbook.

Edited April 29, 2010 by Husky