Thread: Casting Chipping

That sound like a lot of accelerator for 2 Ounces (60mls) of PR.
With the brand of PR I use they recommend 5 drops per 1 Oz. (15mls).
I use only 3 drops/Oz. to avoid the Pr from becoming too brittle.

Les

Resin is naturally brittle and I have found the amount of catalyst makes little difference in bowl filling circumstances. The most important thing is to sand down the sharp edges before returning to turning with chisels, or you will catch and tear it out. I use a dremmel with a little drum sander attachment. Also ensure your chisels are razer sharp, due to the difference in hardness between timber and resin, even slightly blunt chisels will also tend to chip the resin.

Originally Posted by Les in Red Deer

That sound like a lot of accelerator for 2 Ounces (60mls) of PR.
With the brand of PR I use they recommend 5 drops per 1 Oz. (15mls).
I use only 3 drops/Oz. to avoid the Pr from becoming too brittle.

Les

Hmmm! is 5 drops per 15 mill different to 20 drops per 60 mills lol. Some of these things have other dependancies though, temp, thickness etc. my first clear casts took 2 days to harden as I put too little activator in the mix . cheers ~ John

Thanks for the comments gents the insert is only 4mm thick and 25mm wide around the edge of the bowl. So might use less catalyst next time as I am not in a hurry for it to cure.

Cheers Rippa