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Overglaze for kiln fired glass projects is applied prior to firing to prevent surface devitrification. Super Spray can be used on iridescent surfaces and it will not discolor reds, oranges or other sensitive colors. 99.9% lead free. Proven safe for food bearing surfaces. 8 oz bottle.
Shake well before using. Spray or brush a liberal uniform application onto exposed pieces of glass before firing. Fire to 1300-1700° F for a glossy, glass like shine.
Pros : This should be renamed Magic Spray because the ease with which it reverses devit is pure magic in my opinion. I vow never to be without this incredible product. For me it works much better than borax solution.
Cons : The only thing I can think of is that in order to reverse devit you must go above 1300. If devit happens during tack fuse or slumping, taking the piece back up to 1300 can result in some change.
Pros : This stuff is wonderful! Had a piece of glass that one of the pins from the top of the kiln had fallen off on during the cooling stage so it didn't crack the glass totally but left a mark like what happens when your windshield gets hit by a rock. I sprayed this on and full fused the piece again, you can't even tell where the mark was - love this this.
Have you ever noticed ugly, hazy, gray coloration around the edges of your full-fused designs? This is especially noticeable when placing darker colored or iridized glass designs on a lighter colored background but it can happen with any color combination. This phenomenon is known as ‘edge-devit’ (devitrification) and is most often caused by grinding the glass edges prior to fusing. This also occurs when using a diamond blade saw to cut your glass. One glass manufacturer explains it this way; “The roughened edges in the ground area create thousands of tiny points from which crystal growth can easily propagate.” The best solution is to score and break the glass as close to your final shape as possible to minimize grinding (or better yet avoid it altogether). If you must grind you could try using a light coat of clear overglaze (i.e. Fusemaster Super Spray) on the ground areas to create