Posted 09-20-2002 at 21:27:22
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Several good paints out there. I painted the roofs on all of our buildings several years ago. I used an oil primer and an oil paint.
No matter what paint you decide on, the most important thing you can do is clean the old tin good first. I used TSP (tetra- sodium- phosphate)
mixed with water. Put it in your garden sprayer.
Spray down the roof and let it eat away some. Then rinse it off good. Some folks like to use bleach too.
Is your tin a 5 V style, or standing seam? We used a small roller to get the paint spead even along the seams and contours. The roller is made by Whiz. The offer them in 4" and 6". I found the I could get the paint put on pretty fast with the 6" roller. The last roof was on our house with a 11/12 pitch.
Is your roof nailed down with leadheads? (Roofing nails with lead washers). Be careful when pounding them back tight if they are loose. The lead will often fall off the nail, then you have a leak.
You may consider using a galv. screw with a neoprene washer where you have trouble nails. Run the screw in with your battery drill... that way you won't be beating any other nails loose.
Good luck on your paint job. Nothing sounds like rain on a tin roof.