When I do lay ups I cover the surface with rip stop nylon or polyester fabric. On compound curves I use strips about 2 inches wide. It produces a smooth surface and makes sure that the edges of the composite are embedded in the resin, just peel off the cloth. If another layer is required you have a great surface to do a secondary layup, no sanding.
Some hints I would ad is to make sure you don't have any wrinkles in the fabric. Dont stretch the fabric as it causes the layup to distort.
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– Noah Webster, 1787
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