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HVLP spraying question

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Forum topic by dakremer posted 02-11-2015 02:35 AM 586 views 0 times favorited 3 replies Add to Favorites Watch
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dakremer

2583 posts in 2554 days


02-11-2015 02:35 AM

So I used my HVLP sprayer for the first time last weekend (practicing) and it seemed to work pretty well! I thinned the paint out with Windshield Washer fluid. For my first time using it, I think I got pretty good results.

I have the day off tomorrow and plan on painting some of our doors (for our house remodel). I have a few questions.

These are old doors that I have sanded down, and am painting white….

Do you need to still use primer as the first coat when spraying?

Are drying times shorter when spraying? My primer says wait 1 hour before painting, and my paint says wait 4 hours before recoating. It seemed to me that my (practicing) project dried a lot quicker compared to brushing it on.

How many coats should I be shooting for? (how thick to spray each coat) 2-3 coats of paint?

-- Hey you dang woodchucks, quit chucking my wood!!!!


3 replies so far

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timbertailor

1592 posts in 887 days


#1 posted 02-11-2015 03:50 AM

It is always good practice to prime before you paint. Saves money, adds durability (most primers go on thicker to fill holes and scratches), provides for a more even colored finish (less blotching), and helps the final coats stick better longer.

I always follow the mfg’s instructions for drying times, painting temperatures and humidity limits, number of coats, etc. Pay particular attention as many paints and primers now a days require that additional coats be completed within a time limit for best results.

Until you get acclimated, do not sand between coats until you get comfortable with your system and you are ready to attack the tougher projects that require a lot of finish work.

Good luck and post some photos for us when you are done!

P.S. Drying times are usually shorter when spraying because you tend to use FAR less paint than one would with a brush.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

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dakremer

2583 posts in 2554 days


#2 posted 02-11-2015 04:04 AM

i’m gonna try and make a video, or at the least, take lots of pics of my journey during this project! Thanks for the comment, Timbertailor

-- Hey you dang woodchucks, quit chucking my wood!!!!

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MrUnix

4221 posts in 1662 days


#3 posted 02-11-2015 04:15 AM

I’m not sure if I would use windshield washer fluid as the thinner.. it contains water, alcohol and a mild soap. The soap can cause problems on large surfaces, although it might be fine for small stuff like rc cars and planes where it seems to be used by some (and usually with an airbrush, not HVLP gun). Latex thinned with water works fine.. either tap or even better yet, distilled. If you feel the need to use alcohol, regular denatured stuff can be used instead.

I’ve done a lot bi-fold doors with Latex and a HVLP gun and have only used primer once. Didn’t get any better results than I did not using it. Basically, I just consider the first coat of Latex as the primer, then lay down 2 more coats after that; sometime three depending on the project. YMMV.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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