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if i buy just the sensitizer can i mix it with glue the same way i would with emulsion?
will i have the same results? i want to burn images into the screen.....not paint on the glue (way too hard)
what kind of glue would you reccomend? PVA elmers glue?
i'm just starting out so any advice you can give me would be GREAT!!!!
thanks!
will i have the same results? i want to burn images into the screen.....not paint on the glue (way too hard)
what kind of glue would you reccomend? PVA elmers glue?
i'm just starting out so any advice you can give me would be GREAT!!!!
thanks!
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Re: sensitizer & PVA glue
Thu, July 3, 2008 - 7:43 AMI don't see why not.
You can actually make your own sensitizer and add it to regular glue, so I imagine it would be the same if you use a store bought sensitizer. You might have to experiment with your mixture ratios though since emulsion and glue have different physical properties. (I've never bought emulsion though, so I could be wrong)
Homemade Potassium Dichromate sensitizer is mixed with PVA wood glue (I like Elmer's Carpenter glue)
Any wood glue (or white glue for that matter) should work fine. Just be sure to get the "Interior" type. I've tried several other glues and "exterior, waterproof, all weather" grade glues usually cure without any exposure time, ruining your screen. Even Mod Podge cures without exposure. Ruined my very first screen that way!
Wood glue is thicker than white glue, but it's still pretty runny, especially after adding sensitizer. So before I add sensitizer I like to mix about 10% corn starch to the wood glue to thicken it up a little. This will prevent drips and drops from forming on your screen as it dries (a fan also helps)
I'd actually like to thicken it up a bit more, but I think 10% works just fine. I'll have to experiment.
Here is the ratio I use:
1 part corn starch
10 parts glue
2 parts sensitizer
Anyway, I'm glad to hear you're breaking away from the embroidery hoop and mod podge fad. Unfortunately, people often marry "cheap" with "easy".
Making a good screen isn't expensive, it just takes more work than a trip to Walmart craft department!
Hope this helps. Contact me with any further questions. -
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Re: sensitizer & PVA glue
Tue, July 15, 2008 - 1:43 PMcan this homemade emulsion be cleaned out the screen after use? so that you can use a screen for many different images?
thanks
Ben -
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Re: sensitizer & PVA glue
Sun, July 20, 2008 - 10:29 AMNope. That's the only drawback. The PVA glue is permanent. There's probably some way to wash it out, but too much trouble to do so.
I kind of like the idea of archiving my designs anyway.
When I first started using the glue recipe I just saved all my screens and frames for future use.
If the frames use spline or rope pressed into a groove, I've simply removed designs from the frame then reinstalled them later with no trouble. I'm sure anyone experienced in screen printing will tell you NOT to do that though. I just got tired of building frames! You're still paying for the screen material each design though!
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Re: sensitizer & PVA glue
Thu, November 27, 2008 - 12:02 PMI got a similar recipe from someone else lately and I want to try to use it for oversized screens. I work with wide format printers and I want to print my "negative" on vellum or film and make big ol' prints. So I still have the exposure to figure out. My only idea is this 1000 watt grow light I have. I don't even know if it will work but I was wondering what you use and what your exposure time is like? Any adice would be great!
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