[ATM] Pitch laps!!!

[James Sturtevant]

>From: "Norm Prince" <norman.prince at verizon.net>

>So I was going to pour another plaster disk to use as a base
>for the pitch lap, but i'm really freaked out about scratching things and
>don't want to get plaster anywhere near the mirror.

Any plaster is, at least potentially, scratchy stuff so why not try an 
alternative that I have found completely satisfactory - auto body filler 
(Bondo is the most common brand.) I like the fiberglass-filled variety. It's 
strong, stiff, waterproof, grit free and available everywhere.
The only down side is the fumes from the uncured material. Use it outside or 
in a well ventilated room.

>The question(s) is then will a flat plaster disk be acceptable...or should
>it have the same curve as the mirror to become a pitch lap?  Should I just
>go ahead and pour the lap on the tile tool i've been using?

If the mirror curve is not too deep, a flat base will work but since the 
Bondo is easy to cast with the right curve, why take a chance? Just cover 
the mirror with plastic wrap or foil or baking parchment (the parchment is 
easy to peel away from the Bondo after it cures) build a dam around the 
mirror and cast the tool. Be quick. The Bondo, unfortunately, hardens just 
as quickly as most plasters.

Jim Sturtevant

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