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Greenpatch 421 (5 lb container)

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Your Price: $12.00
Greenpatch 421 is a product made for repair of forges and foundries and is great for sealing Inswool/Kaowool insulating blanket.
Part Number: 16
Availability: In Stock.
Greenpatch-421 A 53% alumina, wet, air setting thick patching mortar. This product comes pre-mixed and can easily be thinned with water. 

Greenpatch 421 is a product made for repair of forges and foundries and is great for sealing Inswool/Kaowool insulating blanket.
I have personally used this product for sealing Inswool on the forges I make. It is my opinion, that this is a superior product to Satanite in this application. 
Forge repair. It is rated to patch/repair existing forges or foundries in up to 3 inch thicknesses. Curing is recommended and more than one layer of this product is recommended. 
Manufactured by Harbison Walker

If using Greenpatch 421 to seal Inswool/Kaowool you can thin it with water if needed (you may want to thin if your Inswool/Kaowool tears when applying).
I apply it with a paint brush. A thin coat for the first coat is fine. I let it dry overnight, bring your forge up to dull red and let it cool. This cures and hardens the Greenpatch 421. Then coat again and repeat the curing process. 

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