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Spraying varnish...

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Forum topic by RobH posted 2126 days ago 4813 views 0 times favorited 5 replies Add to Favorites Watch
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RobH

465 posts in 2674 days


2126 days ago

Hey all,

A Harbor Freight recently opened up in town, and I stopped in to see what I could find. One thing I bought was a 20oz gravity feed spray gun. It came highly recommended on other forums, and from what I can tell so far (just shooting mineral spirits and water) it does a decent job.

The only thing I can find wrong so far is that is did not come with a viscosity cup. I have no way of knowing whether I need to thin stuff or not. The tip that came with it is 1.4mm.

Now, here is my question. Will I be able to spray Deft, or equivalent, lacquer directly from the can? If not, I guess I need to try to find a viscosity cup so I can know how to mix stuff.

Thanks ahead of time for the help,

-- -- Rob Hix, King George, VA


5 replies so far

View lew's profile

lew

9990 posts in 2380 days


#1 posted 2126 days ago

Rob,

Try the local auto body shops and ask if they have an old one or where they buy their paint and supplies. Most towns have at least one supply business and you could probably pick one up from them. I bought a similar spray gun from Harbor Freight and I use the cup from my old Wagner Power Sprayer. Seems to work OK. I thin stuff to drain in about 60 seconds for heavier material (latex paints). I think lacquer and water based polys could be sprayed out of the can. I have heard of folks adding a flowing agent to some types of finishes to help them level out but I am not experienced with them.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Shopsmithtom's profile

Shopsmithtom

780 posts in 2819 days


#2 posted 2126 days ago

I’ve done a fair amount of auto painting and a bit of varnish spraying and I wouldn’t recommend spraying any varnish right from the can. While I’ve found that thinning is necessary, I also have found that the mix is somewhat forgiving. I’d try playing with some scrap wood and start with a 4:1 varnish to thinner mix. If that’s too thin try 6:1.
Thin with a compatible solvent. I have thinned with lacquer thinner & haven’t had any problems, but you want to do that outdoors or with a lot of ventilation. I like using a fast evaporating thinner because it flashes off quickly and you don’t get as many runs.
If anyone has had comparability problems with that, please chime in, as I’m not the expert on finishes. I only know from my limited experience.
You’ll need to play with air pressure, too as that will effect the result -SST

-- Accuracy is not in your power tool, it's in you

View sandhill's profile

sandhill

2117 posts in 2548 days


#3 posted 2126 days ago

Rob, try some “Floetrol” from the Borg 1:4 ratio is recommended “I use a little less in winter and more in summer”. If you are using hi-gloss it will dull a little which I like for my applications. Shoot some old scrap until you get the feel. I found cups and what have you only get you in the ball park and you need to adjust from there.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

View Steve2's profile

Steve2

75 posts in 2195 days


#4 posted 2126 days ago

Spraying thinner or water is the most meaningless indication of the quality of any gun and bears no relation whatsoever to what you will eventually experience with a real finish.

Check the literature from the material for proper dilution.

1.4 is the norm for poly varnish – inherently thin lacquer should take very little thinning.

Yea – Great idea – stop in at a professional paint shop and ask for info on your gun from Harbor Freight :) – just be careful he doesn’t have one of his $700 guns within arms length. :)

-- Regards, Steve2

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sandhill

2117 posts in 2548 days


#5 posted 2126 days ago

Im glad you pointed that out about Floetrol I should not have assumed he would know that. Water based products are all I use because of the flash point hazard.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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