Steven Bronstein Posted November 3, 2011 Share Posted November 3, 2011 Does anyone have any experience with Green Patch 421 made by AP Green. It was suggested by a potter friend to use as a repair mortar to fill holes inside my gas forge. It is claimed to be able to fill deep holes i.e. 2" thick. Thanks, Quote Link to comment Share on other sites More sharing options...
Old N Rusty Posted November 3, 2011 Share Posted November 3, 2011 I have used Greenpatch 421 to mortar the lightweight refractory bricks, they get glowing hot , the mortar does not . It does not seem to cement the bricks well either but that might be because the soft bricks are difficult to stick to. When you first open a bucket of G.P.421 you will notice some liquid on top, do not pour it off this must be stirred back into the mix, Ideally with a large electric drill motor paddle stirrer. I would not cast a whole forge floor from this stuff as it is more of a heat sink , than a reflective refractory. One good point, borax flux seems unable to affect G.P. , but will melt the firebrick. Quote Link to comment Share on other sites More sharing options...
Dodge Posted November 3, 2011 Share Posted November 3, 2011 I've coated the ceramic wool in two forges with it. Great stuff!! I diluted it to a thick milkshake consistency and smeared with a rubber gloved hand. USE GLOVES!! At best, it will dry out your skin. At worst, it is a skin irritant! I also cast a 3/4" thick floor. I didn't let it dry long enough and large blister formed on the first firing but I just broke it. No further issues with it. In my experience, borax does seem to be a bit caustic but I've only welded one time in it and it may just be bonded to the floor. All in all, I think its great stuff!! Quote Link to comment Share on other sites More sharing options...
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