Spraying finishes - Router Forums
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post #1 of 24 (permalink) Old 05-04-2015, 09:56 AM Thread Starter
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Default Spraying finishes

Does anyone use, or have thoughts about this?

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post #2 of 24 (permalink) Old 05-04-2015, 05:39 PM
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What type of finish Roger? I have sprayed lacquer and oil based but not water based because I didn't have a gun that would do water based. Lacquer is fairly easy and it dries within seconds. I've had to lay it on heavy enough to look wet because if I didn't it dried rough. That might be fixable but I wasn't interested in doing that. Oil is fairly easy too and because it dries slower will give a smoother finish usually.

Certainly sprayed on finishes look better when done right because of the lack of imperfections like brush marks and overlap marks. You can get pretty decent results with some finishes by hand. The worst results I've had were with finishes that dried too fast. There isn't enough time for the finish to pull itself flat. If the finish is slower drying and you use a really good brush or a foam brush in some cases you can get acceptable results.

What were you thinking of trying?

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post #3 of 24 (permalink) Old 05-05-2015, 07:13 AM
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Roger spray finishes are very easy to do, the normal spray lacquer would be a nitrocellulose thinners based lacquer and they can be bough in various gloss's but the more shinny you get them then the more the imperfections will show, the more matt lacquers are always more forgiving, you can also use a sanding sealer under the lacquer and that will also help to get a good finish as it will cut back smooth far more easy than the lacquer itself will cut back but you could also thin the first coat to 50/50 and spray that as a thinner first coat will sand back better, of course you can also spray turps/oil lacquers, they will take far longer to dry so if you don't have a dust free space to spray them then that can be a problem, keeping the dust motes of it until it drys, thinners based lacquers dry much quicker, it is simple to build a home spray booth to put the object in when it gets sprayed, you can make a frame and cover it with any cloth, old sheets, they wont last for a long time but they will keep the dust off it while the lacquer dries, spray lacquer is easy to do and get used to doing so you won't have any problems, just dont lay it on stupidly as more material is not better, it just will casue runs that have to be dealt with. N
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post #4 of 24 (permalink) Old 05-05-2015, 07:46 AM Thread Starter
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I have been using spray can lacquer with good results. I thought this might be an acceptable way to spray polyurethanes also. And, it seems that it would save me some money by buying quarts of finish, thinners, (which I have anyway), as compared to the high price of the spray cans.

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post #5 of 24 (permalink) Old 05-05-2015, 10:27 AM
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Quote:
Originally Posted by rcp612 View Post
Does anyone use, or have thoughts about this?
Always wear a suitable mask to avoid any inhalation of spray particles.
Ensure adequate ventilation whilst spraying to avoid noxious fumes.
Wear gloves and cover exposed skin as much as possible.

On practical points ensure you have a practice run first so that the exact pressure and spray head setting is correct. Do lots of passes over material (ie keep the spray head moving) in as big a sweeps as possible to avoid runs and drag.

Cheers
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post #6 of 24 (permalink) Old 05-05-2015, 11:08 AM
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Sorry Roger, I didn't notice the first time that "this" was a link. That system looks suitable for small scale projects. I don't know if it is cheaper as the can appears to be the propellant. I have no idea what kind of job it does. It does not appear to be adjustable which would mean you would have to adjust the viscosity until it sprays right unlike a good spray gun which would allow some adjustment range as well as giving different spray patterns.

The big issues with a paint gun system is the cost of the gun, the compressor, and cleaning it when you are done which often takes longer than the painting did. But they are more flexible and usually do a better job.

I remember seeing a relatively cheap HVLP system (high volume low pressure) discussed on the forum that was getting favourable reviews. You should be able to search and find it.

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post #7 of 24 (permalink) Old 05-05-2015, 11:51 AM
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I just sprayed a project with Watco Semi Gloss lacquer from a spray can and when I dried it turned white. I mean white, white, not milky white.Ruined my project had to spend a day trying to strip it it all off with acetone and what a miserable job. Couldn't get it all off still shows some white in places. My first try at Watco Lacquer, I had always used Deft before with no problems.
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post #8 of 24 (permalink) Old 05-05-2015, 03:53 PM
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Unless you want to paint with a color or finish you can not buy off the shelf I see no advantage
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post #9 of 24 (permalink) Old 05-05-2015, 06:17 PM
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came across this after looking into the product...


interesting

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post #10 of 24 (permalink) Old 05-06-2015, 06:46 AM Thread Starter
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I've been using rattle can Watco gloss lacquer with good results.
What I was looking at was that a rattle can has 11.4 oz and the Preval says it will spray 16 oz. Using a lacquer of my choice, mixed with a retarder, could give better results than I'm now getting. Plus, I'd be able to use shellac, or other finishes as well. I thought possibly someone out there had tried this sprayer before and could share some thoughts.
Thanks for all the input guys.

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