74-30 Urethane Rubber

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Something you won't mind throwing out if you need to.
I usually hit the Dollar Store and pick up those Rubbermaid type
bowls (not brand name, though) You can probably get them
for about $2 for 3 bowls. And a cheap spatula for $1.

If you're lucky, it will all peel out when it cures.. but if it won't,
then you're only out a few dollars. Part of the cost.
 
I mix mine in a plastic painters pail and after it hardens, I just peal it out and use the pail again.....

No need to throw away....
 
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