Comments on: Solutions for PhotoResist Blow Outs http://www.glassetchingsecrets.com/blog/photoresist-blowouts/ Updated information on glass art, the craft of etching, sandcarving, and the engraving industry with glass, metal, or anything. Thu, 09 Feb 2012 16:44:10 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Eric Robert http://www.glassetchingsecrets.com/blog/photoresist-blowouts/comment-page-1/#comment-149 Eric Robert Fri, 12 Mar 2010 20:25:53 +0000 http://www.glassetchingsecrets.com/blog/?p=240#comment-149 Hi Jason, I have been using Rayzist photoresist, but I am sure the others such as Photobrasives brand work just as well. I hear both are quality brands. I assume your second question only pertains to the blow through of the light protective layer or the residue over the areas that need to be blasted (exposed areas) and not the actual stencil areas. I am not sure about the exact pressure and grit combination to blast through would be. It should be able to blast through at any pressure which would etch the glass. My guess would be 10-15 psi could blast through at a typical grit used such as 150 grit. Maybe I'll test that for you. But even if you have a fine grit or a low pressure it might blast through but at a much slower rate. It could still blast through but with longer blasting time. I assume your using a small airbrush sandblaster. Best bet would be to ask the photoresist company. I'll try and test a low pressure setting one of these times. I hope that helps. Hi Jason, I have been using Rayzist photoresist, but I am sure the others such as Photobrasives brand work just as well. I hear both are quality brands.

I assume your second question only pertains to the blow through of the light protective layer or the residue over the areas that need to be blasted (exposed areas) and not the actual stencil areas. I am not sure about the exact pressure and grit combination to blast through would be. It should be able to blast through at any pressure which would etch the glass. My guess would be 10-15 psi could blast through at a typical grit used such as 150 grit. Maybe I’ll test that for you. But even if you have a fine grit or a low pressure it might blast through but at a much slower rate. It could still blast through but with longer blasting time.

I assume your using a small airbrush sandblaster. Best bet would be to ask the photoresist company. I’ll try and test a low pressure setting one of these times. I hope that helps.

]]> By: Jason http://www.glassetchingsecrets.com/blog/photoresist-blowouts/comment-page-1/#comment-148 Jason Fri, 12 Mar 2010 18:29:06 +0000 http://www.glassetchingsecrets.com/blog/?p=240#comment-148 Good summary, it triggers two questions for me. 1. what photoresist do you use? 2. what is the threshold for "blow-through", instead of blowoffs. Meaning, how much pressure and large grit sand can I use before I blow through the protective layer? Good summary, it triggers two questions for me.
1. what photoresist do you use?
2. what is the threshold for “blow-through”, instead of blowoffs. Meaning, how much pressure and large grit sand can I use before I blow through the protective layer?

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