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Devit sprays
Posted: Thu Oct 23, 2003 7:40 am
by Liam
I usually use Borax, but I am doing some low temp slumping of stained glass for bent lamp panels. Borax doesn't seem to mature properly for me at these temps. I seem to remember that spray-A and superspray had different maturing temps. Does anyone know about this?
Liam
Re: Devit sprays
Posted: Thu Oct 23, 2003 11:55 am
by Bert Weiss
Liam wrote:I usually use Borax, but I am doing some low temp slumping of stained glass for bent lamp panels. Borax doesn't seem to mature properly for me at these temps. I seem to remember that spray-A and superspray had different maturing temps. Does anyone know about this?
Liam
Liam
The sprays you mentioned all mature around 1400ºF, I believe. There are a couple of lower temp, high lead sprays. One is back magic. I have yet to hear anybody say that it was actually good for anything on this board. I think there might be one more in the middle that works for that app. Wissmach devits when you think about too hard.
I just looked at the Fusion HQ link on the sponsor links and Gil says that the hi temp overglazes mature at 1350. He also sells a bending overglaze that he says works at 1100. I'd try that. Let us know how it works for you.
Re: Devit sprays
Posted: Thu Oct 23, 2003 2:49 pm
by gone
Liam wrote:I usually use Borax, but I am doing some low temp slumping of stained glass for bent lamp panels. Borax doesn't seem to mature properly for me at these temps. I seem to remember that spray-A and superspray had different maturing temps. Does anyone know about this?
Liam
Hi Liam,
Are you sure you'll really need an overglaze at those low temps?
Els
Posted: Thu Oct 23, 2003 7:03 pm
by Vic
I've used the bending glaze on Wissmach and Kokomo "honey-beige" glass. It works OK, but the glass looks a bit like plastic. It's not the same shine as the glass.
Posted: Thu Oct 23, 2003 10:59 pm
by Liam
Thanks vic, I want to replicate old glass, and not change the appearance. Yes a good devit spray would be nice as I am using glass that loves to devit badly, in particlular Kokomo K11. I would bet half of the lamps Ive seen needing repair have that glass. The trick is going very fast to avoid devit, but I'm afraid if I go to fast I will break my hydroperm mold. I'm getting about a 50% success rate now on devit and I am taking all the cleaning precautions.
Liam
Posted: Fri Oct 24, 2003 6:01 pm
by Vic
I make my lamp molds from "castalite" by A.P. Green 201-589-5855.
I'll bet you can't break this mold material.
Posted: Fri Oct 24, 2003 10:06 pm
by BobbieMatus
I have used kokomo k11 for fusing, I used the superspray on it and it fused very nicely.
Bobbie
Posted: Fri Oct 24, 2003 11:11 pm
by Bert Weiss
Liam wrote:Thanks vic, I want to replicate old glass, and not change the appearance. Yes a good devit spray would be nice as I am using glass that loves to devit badly, in particlular Kokomo K11. I would bet half of the lamps Ive seen needing repair have that glass. The trick is going very fast to avoid devit, but I'm afraid if I go to fast I will break my hydroperm mold. I'm getting about a 50% success rate now on devit and I am taking all the cleaning precautions.
Liam
Liam if you whip your hydroperm right, it should take firing fast.
Zircar makes a wet felt that can make molds that will fire infinitely fast, pricey though. 845-651-2200