 Ceramic Blanket Coatings
I use 3,000 degree mortar, thinned to a "slurry." It will be a little more brittle, but for the cost, it is easy to patch when necessary. It cost me about $15.00 for a 2 1/2 gallon pale already mixed. I break it down into smaller containers so that it does not dry out. When needed I literally grab a hand full or two and add some water in a large coffee can, then smear it over the fiber blanket that needs it. Takes very little time and can normally be fired right away. I find that it still does a pretty good job of containing the errant fibers. It may not be as durable as the other products, but again for the cost and ease of use, I prefer it.
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