It is probably the best as far as performance goes even without degassing although great should be taken to avoid introducing air into the mix. I'd mix a small amount ... 1-2 oz of each side and mix slowly and thoroughly to make sure you will not introduce too much air that will negatively impact the part and pouring that mixture into a cup to test. This will give you an idea of the amount of air you should anticipate in your cast piece. Painting the Performance 80 with an acrylic paint/primer ... I use Krylon ColorMaster Paint + Primer with Durable CoverMax ... to cover, color, and protect the urethane from exterior elements.