Archie wrote:

. I tried out the walnut shells in my blaster today and they get most of

the thick stuff off but leave most of the baked on varnish. I think
I am going to use glass beads and clean it thoroughly after that. I am

sure

my measly 2 HP air compressor cannot imbed glass beads in cast iron.

Don't bet on it.
If, in fact, you are using real glass BEADS,
(which are used for peening),
they break down into smaller, multi faceted,
imbeddable devices.
After blasting, clean as best you can, and then
boil them in HOT water. You will, upon completion,
find more glass in the solution due to the metal
expanding and releasing imbedded material.
Archie

Anything beats California/CARB/EPA emasculated carb cleaner.

I will inspect a sample with a magnifying glass. I have a water pump
that was glass bead blasted.

Thanks for the tip Archie.

Paul Lamar
 
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