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Why thin lacquer?

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Forum topic by wwbob posted 10-18-2011 02:38 AM 4700 views 1 time favorited 9 replies Add to Favorites Watch
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wwbob

107 posts in 1531 days


10-18-2011 02:38 AM

Topic tags/keywords: finishing hvlp spray lacquer thinning

I’m spraying lacquer for the first time with my new Earlex 5500 HVLP spray system. Following the Earlex instructions, I checked the viscosity of the Deft lacquer. The lacquer was viscous enough without thinning. Prior to this I used an HVLP conversion gun and my instructor said a 25% to 33% dilution with lacquer thinner was the way to go.

I’m confused as I sprayed unthinned lacquer on a test case then the counter top with no problems AND much less fumes.

It was explained to me that the thinner will help the lacquer “flatten out.” Any other reasons?

Bob, the perpetual beginner.

-- "I like the quiet I hear." - Channing, age 4


9 replies so far

View Sawkerf's profile

Sawkerf

1730 posts in 1724 days


#1 posted 10-18-2011 03:21 AM

Lacquer dries so quickly, that some thinning may be necessary, but you should try it without thinner and see how it goes, before you thin it. It will probably take you a while to get all dialed in with your new gun.

-- Adversity doesn't build character...................it reveals it.

View a1Jim's profile

a1Jim

112093 posts in 2233 days


#2 posted 10-18-2011 03:47 AM

When you spray with any gun or system there is always a bit of trial and error involved. Guns very according to how they atomize the material your spraying. It also has to do with what size needle your using and the air pressure , temperature and humidity that’s present.

-- http://artisticwoodstudio.com Custom furniture

View 747DRVR's profile

747DRVR

199 posts in 2012 days


#3 posted 10-18-2011 04:02 AM

I never thin lacquer when I spray with my conversion gun.I usually spray SW precat

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Grandpa

3133 posts in 1331 days


#4 posted 10-18-2011 04:08 AM

I think a lot of this depends on the temperature and climate you live in. I see that you have listed Mesa AZ so you should try a little and thin if you need a smoother finish. Typically laquer dries before it can lay down so you thin it to give it that little bit of extra time. Do what works for you.

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747DRVR

199 posts in 2012 days


#5 posted 10-18-2011 04:39 AM

If it is very warm out I think retarder would work better than thinning.

View Kent Shepherd's profile

Kent Shepherd

2698 posts in 1942 days


#6 posted 10-18-2011 10:18 PM

Jim was right, but to take it a step further, not all lacquer is created equal. There is not a standard formula for thinning lacquer. Some brands require more thinner while others don’t need any.

Experience will teach you the difference. I never even read the can anymore.

-- She thought I hung the moon--now she just thinks I did it wrong

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wwbob

107 posts in 1531 days


#7 posted 10-19-2011 06:03 AM

Thanks for the suggestions. I finished spraying today. I learned I was moving the spray gun too fast. I did not do any thinning. Here in the Phoenix area, it was warm and dry allowing for recoating in as little as 15 minutes. I need to learn more about spraying, but can’t seem to work up the energy to do a bunch of testing.

Thanks,
Bob

-- "I like the quiet I hear." - Channing, age 4

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Earlextech

979 posts in 1346 days


#8 posted 10-19-2011 04:07 PM

I’ve found that the Deft lacquer sprays great right out of the can. The most important thing is to make sure it is stirred up well before you put it in the cup and before you spray. I use a 1.5 needle set when using lacquer of any kind.

-- Sam Hamory - The project is never finished until its "finished"!

View tom427cid's profile

tom427cid

294 posts in 1126 days


#9 posted 10-19-2011 06:49 PM

Not having a viscosity gauge/meter years ago I resorted to counting the number of drops that came off the “homemade” stir stick I had. I still have the stick and I still count drops.
I have tried various brands of laquer and as was said earlier not all are equal. Some are pre-thinned and can be sprayed right out of the can. Others need to be thinned as much as 25% according to my “calibrated” stir stick
tom

-- "certified sawdust maker"

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