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"Fixing a Run or
Sag in Your Paint"
Yes it happens to everyone from time to
time a sag or run when applying a clear coat. Even the best of the best have an
off day once in a while, after all what is custom painting if not an exercise
in solving problems. And a sag or a run is nothing more than that another
little problem to be solved along the way.
Below is just one way to
handle the problem of a run or sag in your clear coat.
What you'll need:
wooden paint stir stick, wet dry sand paper (depending on what stage of the
project you are on 800 grit to 2000 grit), bucket of water and of course a sag
or run in some clear.
This little technique will work as well with a
well cured spray bomb clear (like U-Poly) as a two part automotive
clear. |
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Pictured above: There you
have it the dreaded sag or run in the clear coat. And yes thats my handy work
who else would be crazy enough to post on the Internet a mistake they made in a
customers helmet than a person whose company name contains the word airhead.
:-) |
Sponored
by
Airbrush Technique Magazine
Issue #21 cover art by Fitto
click on
the cover for more information. |
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Pictured above: Our bucket of water and
wooden paint stir stick. When using wet / dry sand paper be sure to let the
paper soak for 10 minutes or so. Taken right out of the package and used even
wet the sand paper might will scratch the surface rather than sand the surface.
Always let the paper soak for ten minutes to allow the paper to soften before
using it. |
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Pictured above: Cut an inch or two off
the wooden paint stir stick which you will use to wrap the softened sand paper
around.
Why use a stick? If you where to just use the sand paper lets
say you would find it very hard to ever sand that sag or run out with out
effecting the surrounding surface. The goal is to just sand the high spot ( the
sag or run) and using the hard flat surface (the wooden stir stick) allows you
to do just that with out effecting the area around the sag.
Which grit
sand paper to use? Depends on if this is the final clear coat to be buffed or
just a protective clear over some art work and more art work is to be
added. |
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Pictured above: With your sand paper
stick you want to sand going across the sag or run. Provided there is no
solvent pop in the run or sag this should cut the run, sag down in no time. Be
sure you have given the clear enough time to cure 100% before attempting this.
Start out with a courser grit sand paper and use a finer grit sand paper as the
run, sag gets down closer to the surrounding area. Keep the paper wet at all
times during this. Sand with the stick flat against the
surface. |
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Pictured above: As you can see my run,
sag has pretty well disappeared, at this point you might want to start using a
very fine grit sand paper. If its a final clear you might want to be using 2000
or 2500 grit at this point.Be careful not to go to far and flat spot that area
or worse sand down thru the clear. |
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Pictured above: There you have it no more
sag or run ready to be buffed or with the rest of the surface scuffed ready for
more art work.
There are other ways to handle this problem but this is
one I have found easy to use. Hope you find this helpful, keep spraying and
have fun, until next time.
Don Johnson
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I hope you found this short
article helpful. If you find this website helpful you'd love my airbrush,
kustom painting magazines. Check them out via the links below. Until next time
"It's just paint" have fun.
Airbrush Technique
Magazine
Airbrush
Artist Magazine
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this tutorial may be reproduced, stored in a retrieval system or transmitted in
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or otherwise, without prior permission in writing from Airhead Airbrush. Com ,
Inc. |
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