Marine Spar Varnish
Mirrorcoat Projects Outside.
If your Mirrorcoat® project is going outside, and will be exposed to a significant amount of sun, it needs to have UV protection. The epoxy coating cannot be modified to provide this protection for itself. So, for exterior applications, to keep your project looking its best for the long term, apply one of our UV-resistant coatings over the epoxy. We manufacture two:
How do I thin down or lower the viscosity of the Marine Spar Varnish?
The Marine Spar Varnish can be thinned with mineral spirits at up to 10-15% by weight.
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.