Can I spray Water based Poly? - Woodworking Talk - Woodworkers Forum
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post #1 of 11 Old 07-14-2020, 05:31 PM Thread Starter
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Can I spray Water based Poly?

If so, does it need to be thinned.

Hvlp air gun is what I would use.

I like the Idea of a quick dry, and a reduction of odor compared to Lacquer.

The application would be cabinet doors.


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post #2 of 11 Old 07-14-2020, 06:41 PM
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Yes, you can. It's shockingly easy, as long as you apply thin coats.

I use Varathane and the Rockler HVLP. I didn't have to thin it.

Go as thin as you can while still getting coverage, and it will dry in minutes. After a few coats, sand lightly with 320 or 400. The last coat should not be sanded. You can put on three to four thin coats in a day.

I got a great finish on my wife's dresser using this process.

This was my first time spraying WB poly. I got the sprayer dialed in, and it was easy.

I would highly recommend this video from Wood Whisperer.

https://youtu.be/kiOylCZjNEI
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post #3 of 11 Old 07-14-2020, 08:44 PM
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You have to watch over spray on water base. Slow it down amd don't let it dry to fast. I srayed it once and never sprayed water base agsin. I only spray oil now...
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post #4 of 11 Old 07-14-2020, 09:30 PM
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Yes. I have recently sprayed quite a bit of Varathane water based poly with good results. I use an inexpensive low volume low pressure (LVLP as opposed to HVLP) gun and use about 15-20 psi without thinning. It works quite well.
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post #5 of 11 Old 07-14-2020, 09:47 PM Thread Starter
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Originally Posted by Rebelwork View Post
You have to watch over spray on water base. Slow it down amd don't let it dry to fast. I srayed it once and never sprayed water base agsin. I only spray oil now...

Is that because of the trouble you had spraying it, or just prefer standard poly?


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post #6 of 11 Old 07-15-2020, 11:08 AM
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Not germaine to question, but thought I'd throw in once I tried a water based conversion varnish it is now my "go to" for top coats.

Specifically, Target Coatings EM8000.
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post #7 of 11 Old 07-15-2020, 12:45 PM
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Quote:
Originally Posted by furnacefighter15 View Post
Is that because of the trouble you had spraying it, or just prefer standard poly?


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Air from the hvlp was causing premature drying which caused the finish to look like over spray..

I'm a little less complicated with finishes where others on here get all complicated...

I like the results I get with oil...years ago I was going to move to coversion varnish but to whole kitchen cabinet sets but it was recommended that I stay with pre-cats for this... look up the data sheet on S&W T77. Onice dry lacquer nor water can hurt it...
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post #8 of 11 Old 07-15-2020, 02:57 PM
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Quote:
Originally Posted by DrRobert View Post
Not germaine to question, but thought I'd throw in once I tried a water based conversion varnish it is now my "go to" for top coats.

Specifically, Target Coatings EM8000.
Thanks for the info! I've wanted to try conversion varnish for while, but didn't know they made a water-borne formula. On a similar note, I've been using PPG Breakthrough for a few years now, which is a waterborne acrylic. Unless it is a very small area, I spray this as well and am quite satisfied with the results.

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post #9 of 11 Old 07-16-2020, 01:36 AM
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Thirty two cents worth here.

You are paying a lot for the polyurethane, buy some distilled water (Steam iron water) to thin the product. You don't know how the substances in well, municipal or cistern water will affect the polyurethane.
Minwax Polycrylic is about $20 w/tax a quart or almost $80 a gallon. Why mess it up trying to save a few cents on the water to thin it.

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post #10 of 11 Old 07-16-2020, 08:27 AM Thread Starter
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Thirty two cents worth here.

You are paying a lot for the polyurethane, buy some distilled water (Steam iron water) to thin the product. You don't know how the substances in well, municipal or cistern water will affect the polyurethane.
Minwax Polycrylic is about $20 w/tax a quart or almost $80 a gallon. Why mess it up trying to save a few cents on the water to thin it.

I have an iron removal system and an RO. I would use the RO water. Nearly as pure as distilled.


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post #11 of 11 Old 08-02-2020, 01:51 PM Thread Starter
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Little update:

I ended up using Varathane oil based poly.

2 base coats dewaxed shellac and 3 coats of poly.

Used a cheapo syphon feed gun from HF. Thinned the poly with Naptha at 20% of vollume.

Turned out great.







Trouble was I installed the cabinet carcasses prior to finishing them. And I did not want to spray inside, so I brushed on the poly. Which worked fine, but did not turn out as good as the spray.

So I ended up masking off the entire kitchen and spraying the poly. That was a mistake. Not ventilated well enough, so seeing the top coat was difficult, and ended up with some runs, that had to be sanded down, and ended up sanding through the veneer on one of the side panels. So I had to replace it.

Long story short, dont try to spray clear coats indoors without good ventilation, which is difficult to accomplish.


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