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I slump float glass over stainless steel molds. Hi-Temp 1800 works great on the mold. When I slump 2 pieces of glass stacked, I spray a light coat of Hi Temp 1800 on one of them but it leaves a haze that is difficult to remove. Any suggestions to keep the glass from sticking to each other ? Thanks Mike

Why would you stack two pieces of glass on top of each other, and not want them to fused together?

The boron nitride spray is for coating molds, not glass. I suppose you could use 1/8" fiber paper between the two pieces if you are really bent on fusing two at a time.

From my experience, Hi Temp 1800 is inferior to MR-97. Every time I've used the High Temp it has clouded my glass like you suggest. MR-97 does not do that (in my experience).

Dana W.

Thanks Dana, I stack the glass so it doubles the amount pieces made in each firing.

I have used Thin Fire paper but that gets expensive.

I am not familiar with MR- 97 but will give a try . Thanks again ! Mike

Try sifting down a separator--dry kilnwash, plaster of paris, alumina, that sort of thing. If you coat it well (and evenly) you should get separation without the expense of BN.

Morganica wrote:Try sifting down a separator--dry kilnwash, plaster of paris, alumina, that sort of thing. If you coat it well (and evenly) you should get separation without the expense of BN.

That is how windshields are made.

you can also make a wash with pure alumina and a binder (cmc, elmers glue, sugar) for green strength and spray on a smooth coat. let dry and stack. r.