Sand after the last coat. The reasons for more than one coat is one coat alone won't fill the weave; if you try to, a great deal of drips will result. Multiple coats allow you to gradually fill the weave. Once that's done, you need to even it out a catch whatever drips occurred. I wouldn't even sand drips until the weave is completely filled--you don't want to cut into the fiberglass cloth, which will be easy to do if the weave isn't filled.
Also, epoxy doesn't need "tooth"--that texture you get from sanding--in order to adhere properly.
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RE: Epoxy sanding
» Submitted by dnregen - Tue, 7/28/20 » 2:24 PM
Sand after the last coat. The reasons for more than one coat is one coat alone won't fill the weave; if you try to, a great deal of drips will result. Multiple coats allow you to gradually fill the weave. Once that's done, you need to even it out a catch whatever drips occurred. I wouldn't even sand drips until the weave is completely filled--you don't want to cut into the fiberglass cloth, which will be easy to do if the weave isn't filled.
Also, epoxy doesn't need "tooth"--that texture you get from sanding--in order to adhere properly.