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Forum topic by irish620 posted 05-06-2021 12:15 AM 240 views 0 times favorited 2 replies Add to Favorites Watch
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irish620

62 posts in 3432 days


05-06-2021 12:15 AM

Hey Everybody,
I am finishing a set of large glass windows and a 4×8 large door this week.
I am getting overlapping marks on the rather narrow window frames and I
tried many different ways to try and avoid this without success. I know
there are a bunch of variables like outside temp, needle size, air and fluid
mixtures but I’m just throwing it out there to see what you think.

Trying to get a nice uniform coating with this new lacquer I’m trying out.

Tomorrow morning, I’m gonna move from a #3 (.050) needle set to a #4 (.070)
and thin down the lacquer with lacquer thinner? by 5% and see what that does.
Maybe try a different spray pattern but the window is
so big I think I really have to lay a wet coat down to blend all my passes.

oh ya Im using a 4 stage Capspray hvlp turbine and a Maxum II gun with
a #3 set and the tinted lacquer isn’t thinned.

Any suggestions on how to make this go down smoother?


2 replies so far

View Rich's profile

Rich

6942 posts in 1713 days


#1 posted 05-06-2021 12:33 AM

Instead of thinning it with plain lacquer thinner, use a retarder. Its slow evaporation rate compared to regular thinner allows it time to flow out. It’s especially helpful in hot or humid environments. Two brand names are Sherwin Williams K27 and Mohawk No Blush. I’m sure there are others. Mix in about 10% with your lacquer.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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CaptainKlutz

4568 posts in 2618 days


#2 posted 05-06-2021 02:40 AM

+1 Use some retarder.

The orange peel is indication of poor atomization, and/or solvent flash off before it levels. A turbine HVLP typically has better atomization than conventional gun. Which makes me think it is temp/humidity causing fast solvent evaporation?
+1 on SW K27. It is blend of retarder solvents that works in many conditions.
Can also use 5-10% MAK or butyl cellosolve as retarder. Depending on your location, can usually buy slower evaporation ‘hot weather’ lacquer thinner too. With low humidity here in AZ, they sell it year round.

Pigmented lacquer needs a slightly larger tip than clear lacquer due fillers, and mfg recommends 0.070 tip. The smaller tip may be part of problem, due not enough material per pass?
Suggest the larger tip, and start with 5% hot weather lacquer thinner and 5% retarder. Use more solvent blend till orange peel stops. If you get to 20% solvent reduction and orange peel doesn’t go away; change the tip settings to improve atomization. Can also spray when it is cooler time of day to slow solvent evaporation too.

Sorry to say, there is some ‘ART’ and experience required to spray a smooth coating.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

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