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Post by patamos on Jun 9, 2016 17:10:17 GMT -8
So I'm about to finish off another vortex heater, and i am also finishing off a garage-to-suite conversion for a friend. And i have all these drywall scraps left over. I've heard of gypsum-based finish plaster and am thinking of giving it a go on the heater - -particularly because clients want a near-white finish. Any thoughts or advice?
pat
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Post by Donkey on Jun 10, 2016 9:07:33 GMT -8
Yeah.. Make small batches, a little wetter than you might think. The stuff goes off quickly, I've seen it set in the pot, while working. You will have to work fast to get the material on and smoothed to your preference before it sets. Drywall mud is essentially gypsum, though there is a lot in there that is NOT gyp. Karl could probably shed light on what all is in there, I don't know the details. Anyway, the drywall mud is FAR easier to use than traditional gypsum and if you don't mind the compromise in favor of ease of use....
I recommend that you experiment a bit before committing. Try it out on the same surface material (cob, brick, etc), you don't want ugly surprises on the final build!
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Post by Deleted on Jun 11, 2016 4:48:47 GMT -8
Drywall mud or joint compound consists of stone flour and a hardening agent. It may contain talc, perlite, clay, calcite (limestone), mica, acetates and polymers. Hardening agents are gypsum, lime, or cement. Hardening time may vary from five minutes to several days, depending on type and amount of hardening agent and thickness. Gypsum is considered as unsafe for temperatures above 50°C.
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Post by patamos on Jun 11, 2016 21:11:16 GMT -8
Thank you both.
Well, i think the matter of gypsum being unsafe over 50c is reason enough to not use it on the heater. Might go for lime-sand instead
Might still try it on a wall somewhere. I'm thinking of soaking the drywall offcuts to peel the paper then blending the innards. Small test batches for sure.
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