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Painting with Two-Pack
Steve:
I've just finished painting a 30' sailboat hull with two-part polyurethane using foam rollers, and learned a lot along the way. I was reluctant to even consider spraying the paint, since I have no experience with spray equipment, and because of the potential health ramifications. The suggested method of manually using these products - regardless of manufacturer - is generally known as the 'roll and tip' method, whereby one rolls on a small (say 6 sq ft) area then immediately 'tips' (lightly brushes) off the roller stipple. I began by attempting to do this with the Epifanes two-part polyurethane, with results similar to what you seem to be experiencing, i.e. remaining brush marks (my environmental conditions were 80 deg F @ 50 % r.h.). Unhappy with the results, I sanded off the Epifanes, taped off the boat's transom into 3 similarly sized areas, then applied Awl Grip (US Paint) to one area, Interlux two-part the next, and the Epifanes two-part to the third, all using identical equipment, and within a few minutes of each other. The hands-down winner was Awl Grip, which had just detectable remaining brush marks. The Interlux was second, and the Epifanes third (in my opinion). I subsequently was turned on to (via this forum) what I now call the 'fridge' method of applying this paint. CAUTION: This method worked for me using Awl Grip Off White, and may not be applicable to any other paint/color combination or in different temp/humidity conditions. By mixing up the base/reactor/reducer the night before application, then covering and placing in the refrigerator (about 8 hours between mixing and use), the Awl Grip was applied using only the foam roller, with INCREDIBLE results. Flow out was excellent, zero roller stipple, zero brush marks, in short a "sprayed" result without the sprayer. I don't know if a foam roller is applicable for painting a Rolls, but if you ever need to paint a boat hull... Mike Worrall Los Angeles |
#2
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Painting with Two-Pack
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#3
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Painting with Two-Pack
Mike,
A good place to start when confronted with a problem like this is the Material Safety Data Sheet's. Look up both Awl Grip and the 709 and see what percentages of solvents are used in each and if the Awl Grip has any different ingredients. If so, play with the percentages and ingredients of the 709. Sometimes it will screw things up but sometimes you can make a discovery. Ron |
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