When I wanted to coat the inside of the doors on my 240Z that I was painting
with POR, I bought the thinner sold by the POR folks. My intent was to use a
regular touch up gun to spray it into the door cavity.
One HUGE note, DO wear an organic vapor / dust respirator. DO make sure there
is plenty of fresh air (don't try this indoors). DO wear a long sleeve shirt.
DO wear safety goggles to limit fumes near your eyes.
Unfortunately, the instructions read to not dilute more than 5% by volume, which
did not allow for proper spraying. The only way I could get the gun to spray
was to boost the pressure to close to 60 pounds, and then it still sputtered.
Since there were areas that I decidedly wanted to coat with POR but would have
found impossible to do so with a brush, I had to find a solution.
At Harbor Freight Tools I found the solution. It is a simple syphon feed
blower. This blower looks just like a regular air blower that you get with most
air tool kits, with the exception that the nozzle of the blower is a tad longer
and has a tube fitting attached to the bottom of it. That tube fitting has a
length of clear tubing that you can insert into your can of POR, and allow the
vaccuum / venturi draw the POR up into the nozzle and then spray it out the tip
of the blower.
I was able to paint the inside of the cowl, the rocker panels (from inside), and
both rear fenders from below the windows to the side marker light in less than
an hour. I used less than a quart for all of this. Coverage was excellent and
I did NOT have to thin the POR down at all.
Since then I recommended this to a friend and he did it on his Z and was able to
coat many areas that otherwise would have been impossible to paint, simply due
to the difficulty in getting your hand in there with a brush.
Clean up is extremely simple. Disconnect the clear tubing, allow to drain
either back into the can or not, and discard. The tip of the nozzle can simply
be inserted into a cup of lacquer thinner and once you replace the tubing you
are ready for the next shoot. I found that I got LESS dirty doing it this way
than with the brush method.
Hope this helps.
Enrique Scanlon
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