02-01-2010, 11:42 AM
SWC - I'm curious, as Hydro-cal" should be VERY strong - it's die-maker plaster, so fine-grained and hard as stone - how thick a piece did you make ? Careful filling of the mold, and some "bumping" of the mold/careful agitation will minimize air pockets/bubbles. Has your plaster been exposed to moisture in storage, compromising its strength ? I have used files and rasps on 1/4" thick un-reinforced plaster castings without breakage, then snapped 'em with my "Pointing" tool. :oops: Bob C.
James Thurber - "It is better to know some of the questions than all of the answers."