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Forum topic by Madmark2 posted 12-26-2019 02:35 AM 520 views 0 times favorited 9 replies Add to Favorites Watch
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Madmark2

2323 posts in 1604 days


12-26-2019 02:35 AM

Topic tags/keywords: poly polyurethane hvlp spray mask question

Just started HVLP spraying with poly cut 50%-50% with mineral spirits in one of the benchtop paint tents. When I looked up there was a cloud layer from the ceiling down about 2’. I kicked the fans on and it cleared in a few minutes. But as I sprayed the cloud quickly reappeared. Is this normal? I guess its time to start wearing a mask.

M

-- The hump with the stump and the pump!


9 replies so far

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AlaskaGuy

6413 posts in 3324 days


#1 posted 12-26-2019 02:48 AM

Poly is not a great product to spray. It dries to slow and can leave a sticky messy all over everything it lands. I spray it one time. Won’t do it again.

Don’t misunderstand I didn’t say you can’t spray it. There are YouTube videos on the subject.

-- Alaskan's for Global warming!

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JackDuren

1465 posts in 1975 days


#2 posted 12-26-2019 02:56 AM

Poly has its drawbacks. You really want to heat the shop in the winter, open the door, spray , clear the fog out and shut the door. Summer isn’t bad as the door is already opened unless your air conditioned like me but I repeat the same process for summer…

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Madmark2

2323 posts in 1604 days


#3 posted 12-26-2019 03:18 AM

Florida shop. Was 80°F today. Seemed to dry fairly quickly even at 65°F last night. Put on three coats in less than an hour. Goes on nice but need a Scott air-pak breathe!

-- The hump with the stump and the pump!

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JackDuren

1465 posts in 1975 days


#4 posted 12-26-2019 03:26 AM

You’ll have to change filters more often with poly. I use the thickest poly

I can find which is S&W. I use to use Red Devil before it was gone. All my tables get poly on top and pre cat on the untouched parts.

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JackDuren

1465 posts in 1975 days


#5 posted 12-26-2019 03:31 AM

I only cut poly enough to make it spray correctly. Up to 50/50. If your poly is thin to start only delute enough to make it spray correctly. No more..

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OSU55

2740 posts in 3005 days


#6 posted 12-26-2019 01:14 PM

Cloud layer when spraying – depends on shop size and amount sprayed, but yes it is normal for overspray to create a cloud. If spraying flammable solvents I cross flow with outside air to move it out. With wb it doesnt matter other than the amount of dry finish that falls out.

With solvent poly you will probably find little droplets dried on stuff all over your shop. Unlike wb and other solvent finishes such as lacquer and shellac, the ob ply overspray wont dry before settling out, leaving little droplets all over.

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JackDuren

1465 posts in 1975 days


#7 posted 12-26-2019 01:27 PM

You don’t usually get a film unless it’s close to where you are shooting. Clear roll plastic is cheap at the big box. Lay it out spray all done…

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hkmiller

247 posts in 1097 days


#8 posted 12-26-2019 04:03 PM

You might want to try using a lacquer depending on what you’re spraying either pre-catalyzed or a cab acrylic or conversion varnish great finish dries fast.

If you have a Benjamin Moore dealer in your area the Lenmar is a great product.

-- always something

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JackDuren

1465 posts in 1975 days


#9 posted 12-26-2019 04:12 PM

Pre-cats tend to be hard and Crack if hit hard. Conversion is better in a controlled environment. Poly is excellent if you need to touch up. Why I use them on top of my tables

We were using conversion on the last job. Cadillac finishes aren’t designed for dusty shops…

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