Sanding sealer is not required when using easylam epoxy for fiberglassing
One less step

I meant EZLAM epoxy

Originally Posted by boothg-3

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A trick learned from Merlyn Graves use drywall compound from a local home store
Use it as a filler for low spots it sands easily and when it is dry is is almost weightless
There is no need for a sanding sealer to be applied
The ezlam epoxy soaks into the drywall material , hardens it and bonds it to the air frame
And only one coat of ezlam is required to glass the surface once dry and excess trimmed away you use a couple of heavy coats of primer to fill the rest of the weave , this also adds very little weight since most of its weight comes from the solvents in the primer once it flashes off the majority of the primers weight is gone

Is there a link to Graves' use of drywall compound?