getting a flat and level back on a one piece mould?

M

mark1984

Guest

• Oct 2, 2016

• #1

Hi, I've tried a few methods of getting the back of moulds (badges in this case) as flat as possible- not finding it easy though. I put a sheet of plastic and a weight over them which is quite successful- however if its too quick it leaves airbubbles and too slow and the polyurethane resin has already hardened.
Any tips would be fantastic!
Thanks

 

rbeach84

Sr Member

• Oct 2, 2016

• #2

I believe you'll pretty much need to sand it flat a bit regardless of whatever you try...

R/ Robert

 

robn1

Master Member

• Oct 2, 2016

• #3

That's how I do it, with a plastic sheet or a flat slab of silicone and a weight on top. I use a pressure pot to eliminate bubbles, works the same as a two part mold.

This piece was made with a silicone slab, fresh from the mold with no sanding.

 

rbeach84

Sr Member

• Oct 2, 2016

• #4

Yup, a pressure pot would make a difference with the bubbles...

R/ Robert