To prepare for application of a primer, barrier coat, topcoat, or gelcoat, allow the last layer of fairing compound to cure completely, then sand. Sanding makes the surface fair by smoothing down the high spots, and it roughs up the surface so the primer can adhere better. How much sanding you need to do depends on how smoothly the fairing material was applied. Sand the surface until it is fair and smooth.
Use a vacuum cleaner to remove sanding residue, then use a clean, lint-free cloth and denatured alcohol or acetone to wipe down the surface. Allow the solvent to flash.
Note that if using a high-build primer, it will only cover fine sanding marks or small pinholes in the faired surface. Refer to the primer manufacturer’s recommendation for the type of sandpaper to use for surface preparation prior to priming with a high-build epoxy primer.
Sanding generates toxic dust, so work in a well-ventilated area and wear protective clothing, and use proper dust collection methods. Be sure you also wear appropriate eye protection and a high-quality respirator at all times during this process.
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