WR-LPU offers better UV protection for epoxy resins and the surface underneath better than Marine Spar Varnish. How much better depends on the length and severity of the exposure. WR-LPU is a little more expensive, but being waterborne, is available anywhere in North America. Spar Varnish contains VOC content, and its use is restricted in some areas, but if available, offers more ease-of-application and a cost savings over WR-LPU.
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