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Marine Spar Varnish Over Sanding Sealers

System Three® Marine Spar Varnish can be used over some sanding sealers but it will depend on the formulation of the sealer. Most lacquer-based sanding sealers are not recommended because the sanding aids are wax-related. We recommend testing the varnish over any other sealers in a small section to ensure you get good adhesion between the two coatings.  Also, for future reference, the Spar Varnish does not require sanding in between coats if applied within 12-24 hours of the initial coat. 

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