Chuck, Runs may be a part of the learning curve but not a part of everyday
painting...certainly by a pro.
The trick is to know when the coating will run amd stop just before that
point. I found that it is easier to do this when using quality waterborne
coatings...my favorite Target Coatings and not to thin it more than what they
recommend (10%) and to thin with their retardent and not water.
Keep a clean rags available and start spraying. You always want a wet edge
and to work new spraying into this edge. Use a side light to help show the wet
coating. Then, practice, practice, practice.
I look at the surface I'm spraying from, at an angle that I can see
reflected light off the surface I'm spraying when spraying clear coats.
For my first coat, I just spray a very thin glossy coat. (just enough
build till it looks smooth and glossy) Then let it tack up a little.(for
5 minutes or so) Then you can shoot a LITTLE heavier coat over this tack
coat. I sprayed cars myself, and it took a bit of getting use to
spraying clear poly, as I was spraying this stuff on like I would car
paint which sets up very quickly. Poly has to be sprayed on in MUCH
thinner coats, as it does not dry anywhere near as fast as car paints.
You have to reduce it a bit also, as poly is to thick to spray well
right out of the can. I have reduced it with lacquer thinner with good
results. (dries much faster) I'm speaking of Mini-Wax Fast Drying Poly
in my case. The smaller touch up guns work great for spraying furniture
by the way.
Thanks. I am also spraying Minwax Fast Drying Poly thinned about 10% with
mineral spirits. I never thought of using lacquer thinner. How much are
you reducing it?
I am also going to install more lighting fixtures in the shop. I think that
may help as well.
In my case, I was reducing 3 parts poly to 1 part lacquer thinner.
About 25-30%.(allows for a finer spray) I have had really good results
doing so. I spray very thin wet coats. I let each coat dry/tack up,
before spraying another coat, and spray each following coat, over the
previous coat while they are still tacky, but set up well, so insuring
each coat melts in with the other, until I have reached the desired
thickness I want. I was using naptha thinner earlier, but it took to
darned long for the poly to set up in my location, tried the lacquer
thinner and it has worked great for me. Ditto on the lighting, you can't
control what you can't see. I have been using the satin poly.
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