And now for the second batch @ 3:12pm EST
Temperature is the same, but the sun is in a different position.
Off-white paint: 40.9°C
21°C above ambient temperature
Black paint: 53.3°C
33.4°C above ambient temperature
4 coats Solarflex roof paint: 33.4°C
13.5°C above ambient temperature
2 coats Solarflex roof paint: 37.2°C
17.3°C above ambient temperature
2 coats Solarflex roof paint + Hytech beads: 34.2°C
14.3°C above ambient temperature
2 coats Solarflex roof paint + sawdust: 32.4°C
12.5°C above ambient temperature
- Off-white paint: 40.9°C
- Black paint: 53.3°C
- 4 coats Solarflex roof paint: 33.4°C
- 2 coats Solarflex roof paint: 37.2°C
- 2 coats Solarflex roof paint + Hytech beads: 34.2°C
- 2 coats Solarflex roof paint + sawdust: 32.4°C
And the winner of both rounds! ...
SAWDUST AND ROOF PAINT!!!
I'm not all that surprised. It looks like it's all about being thick, white and reflective. Obviously, adding crap to the paint makes it a thicker product, whether it be Hytech NASA beads, sawdust, pixie dust, gravel, shredded tires, etc... A thicker product is more insulation. Now, for my uses, I'm just going to make a thick insulator of more paint layers. It looks nicer and - in the end - is cheaper. The Hytech Bus Kote is $197.50 + shipping for a 5 US gallon pail. Most white, elastomeric roof coatings I've seen (including Henry's Solarflex) hover around $80. I bought the Solarflex for $74 at Ace Hardware. To use twice as much paint on the roof is only $148. I'm going that route.