larry(at)macsmachine.com
Guest
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 Posted: Fri Jun 02, 2006 8:50 am Post subject: water based primer |
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Hi guys,
Its been a while since I mentioned the Hangar 21 AFS water thinned
paints and I felt it was time to report what was happening so far. I
just finished priming all the small panels, inspection plates, covers
and fairings that generally have no internal structures or rivets.
Couldnt be happier with this stuff as its really tough. There are no
odors or over spray to deal with, so my paint booth has been more than
equal to the task
Yesterday, I moved on to the tail group and washed, etched and rinsed
the stabilizer with the hose. As it drained, I noticed the trickle of
water leaving the stabilizer was just a slight yellow. It was wiped down
and blown dry and set at an angle to drip. Each rivet was again blown
dry and wiped with a clean cotton cloth and then left for nearly 4 hours
to evaporate.
Late afternoon, I thinned the paint, put a fog coat on the bottom side
to see how a larger area covers. A third coat covered 95% so the fourth
coat finished the job and it flattened beautifully. No runs, fish eyes
or orange peel. What was noticed was a yellow tint around a few pop
rivets and skin edges. Not a lot, but I surmised the etch solution had
also etched some of the zinc chromate that covers the inside of the
stabilizer.
I let it dry over night and then worked Scotchbrite around the stained
rivets and edges. The primer was so tough I had to use a small stainless
toothbrush to remove the stain around the rivets. Surely it was dry by
now, so I sprayed one covering coat on the bottom again. The cleaned
areas covered real nice, yet a few rivets had a much fainter tinge of
yellow at their perimeter so obviously it hadnt completely dried.
The precaution here is, that in etching an enclosed surface with zinc
chromate inside or other primer, perhaps there should be much more time
between dry off and the first coat of primer. Etch should not be a
process of washing on and washing off, but rather wiping on and wiping
off before rinsing. Other than that, Im really pleased with the process
and its user compatibility within my attached garage. Ive changed the
filters once and the fans arent run above the low setting. Ill report
more detail as I learn more of working through the process.
Do fly safe,
Larry C. McFarland 601HDS at www.macsmachine.com
<http://www.macsmachine.com/>
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