Miles, after doing a bunch of brick buildings with the lightweight spackling mix, I finally had great success cutting up old credit cards and used them both to apply and remove the excess mortar. They have about the perfect flexibility, they don't cut and scrape the brick facing, like metal blades and I made up several widths depending on the brick pattern and layout. I did the Korber Pickle factory as a long flat and with custom cut putty tools I was able to get in to the recess brick areas and use the plastic cards to both apply the mortar and very effectively clean out all the inside corners really well.
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