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When Do You Clean Yor Gun?

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Forum topic by bilyo posted 04-26-2019 12:18 AM 316 views 0 times favorited 13 replies Add to Favorites Watch
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bilyo

661 posts in 1466 days


04-26-2019 12:18 AM

When you are spraying a WB finish that can be re-sprayed in 2 hours, do you completely clean the gun before the next coat or do something else to keep it from drying out while waiting for the first coat to dry?


13 replies so far

View CWWoodworking's profile

CWWoodworking

437 posts in 542 days


#1 posted 04-26-2019 12:31 AM

You have to clean in between coats???

View CaptainKlutz's profile

CaptainKlutz

1238 posts in 1857 days


#2 posted 04-26-2019 12:55 AM

AZ humidity is very low, can not let gun sit for more than ~20-30 minutes or tip gets crusty, even with WB.
So I clean the cup, and shoot a 50/50 blend of alcohol/acetone through gun after each WB use. Had some internal rust formation on HF gun internal parts using WB over several days time, so don’t suggest letting water base finishes sit in gun overnight.
Not an expert, just sharing;
YMMV

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View MSquared's profile

MSquared

446 posts in 277 days


#3 posted 04-26-2019 01:02 AM

Inquiring minds want to know…..

-- Marty, Long Island, NY

View bilyo's profile

bilyo

661 posts in 1466 days


#4 posted 04-26-2019 01:02 AM

I had a pro painter stain our house a few years ago. He used a spray gun and a WB stain. He let his spray gun set in a bucket of water over night. I thought I would ask the question to see if something like that could be done between coats.

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firefighterontheside

20180 posts in 2220 days


#5 posted 04-26-2019 01:02 AM

With my hvlp there’s no need to clean gun. Set it down and pick it up later. Use your fingernail to clear a little drop of finish that dries on the needle. Clean gun when done for the day.

-- Bill M. "People change, walnut doesn't" by Gene.

View CWWoodworking's profile

CWWoodworking

437 posts in 542 days


#6 posted 04-26-2019 01:09 AM

I don’t use water based, but the last time I cleaned the gun was when I bought it. I guess about 100 gallon or so. I soak the air cap every once in a while.

I highly doubt I could do this with WB but I don’t know for sure.

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CWWoodworking

437 posts in 542 days


#7 posted 04-26-2019 01:21 AM



I had a pro painter stain our house a few years ago. He used a spray gun and a WB stain. He let his spray gun set in a bucket of water over night. I thought I would ask the question to see if something like that could be done between coats.

- bilyo

I’m assuming he was using an airless? If so, you can get away with this. At some point, with faster drying WB paints, it comes back to bite you.

I used to spray a fair amount of Breakthrough from Porter through airless. If I left it in over night, it had a propensity to clog.

This was one of the reasons I switched to 100% solvent. It was taking 4 coats to get a finish that was below what I can get in 2 with solvent. Also had to clean the gun every day so it didn’t clog.

With solvent I don’t clean the rig out ever.

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bilyo

661 posts in 1466 days


#8 posted 04-26-2019 02:48 AM

So. I guess, if you think about it, as long as the paint cup has finish in it and is covered, there is no reason the finish should dry up and cause problems any more so than finish in a closed can. ???

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firefighterontheside

20180 posts in 2220 days


#9 posted 04-26-2019 03:41 AM

Right. That’s why you just have to scrape the tiny bit off the outside of the orifice.

-- Bill M. "People change, walnut doesn't" by Gene.

View Fred Hargis's profile

Fred Hargis

5507 posts in 2856 days


#10 posted 04-26-2019 10:37 AM

I don’t do a thorough cleaning, between coats but I do take the air cap off and remove the needle and clean them.

-- Our village hasn't lost it's idiot, he was elected to congress.

View wkndwrnch's profile

wkndwrnch

71 posts in 2732 days


#11 posted 04-26-2019 11:29 AM

When I am done shooting…sorry could not resist lol

View d38's profile

d38

120 posts in 625 days


#12 posted 04-26-2019 01:24 PM

I run the needle to the closed position, and let it set while the coat is drying.
When I’m ready to spray again, I’ll peal the dry piece off the tip, open the needle a full turn or 2 past my actual setting and spay onto cardboard for a bit. Seems like that helps clean any gunk out of the tip. Then I reset the needle, test on cardboard or a sheet of plastic, and do the next coat.
I do 2 coats in a day, then full disassemble/clean for the next day or storage.

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bilyo

661 posts in 1466 days


#13 posted 04-26-2019 02:23 PM



When I am done shooting…sorry could not resist lol

- wkndwrnch


Except for the one above (apology accepted ;>) ... good info. Thanks

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