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.