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Water based polyurethane oil based look

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Forum topic by Carloz posted 07-10-2017 10:50 PM 481 views 0 times favorited 8 replies Add to Favorites Watch
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Carloz

981 posts in 430 days


07-10-2017 10:50 PM

If I apply some oil product like Tung oil, seal it with shellac and cover it with water based polyurethane, will I get the same nice look an oil based polyurethane produces?
The reason I am asking is that i can spray waterbased and the surface is much better than wiped on or especially brushed oil polyurethane.


8 replies so far

View TungOil's profile

TungOil

747 posts in 334 days


#1 posted 07-10-2017 11:10 PM

The only way to know for sure is to prepare some test panels in the wood you are considering applying the finish to. Make up two panels- one for the traditional oil based poly and one for the oil/shellac/WB poly. My guess is that they will look quite different, most of the WB poly I have used over the years does not add much color to the project, its very clear.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View Fred Hargis's profile

Fred Hargis

4762 posts in 2332 days


#2 posted 07-11-2017 02:34 PM

Some of the waterborne finishes have a tint to mimic the look of an oil based varnish, but you have to check the label. Even so they don’t quite get it (to my eyes). I agree with Tungoil, the only way is to try it and see for yourself.

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

View Bill White's profile

Bill White

4807 posts in 3799 days


#3 posted 07-11-2017 04:37 PM

Just make sure that the oil base is fully CURED (not just dry to the touch). Dewaxed shellac, then the water based.
Bill

-- bill@magraphics.us

View Rich's profile

Rich

1984 posts in 428 days


#4 posted 07-11-2017 05:13 PM



The reason I am asking is that i can spray waterbased and the surface is much better than wiped on or especially brushed oil polyurethane.

- Carloz

Why can’t you spray the oil poly?

-- No matter how much you push the envelope, it'll still be stationery.

View Logan Windram's profile

Logan Windram

341 posts in 2301 days


#5 posted 07-11-2017 05:22 PM


The reason I am asking is that i can spray waterbased and the surface is much better than wiped on or especially brushed oil polyurethane.

- Carloz

Why can t you spray the oil poly?

- RichTaylor

I assume if you’re set-up to spray oil based products, you might as well go Pre-Cat Lacquer… my guess is he doesn’t have a proper set-up to spray oil based/ lacquer safely. At that point, i’d probably just do wipe on vanish, might be a lot qicker/ easier sans the clean-up.

View Carloz's profile

Carloz

981 posts in 430 days


#6 posted 07-11-2017 06:58 PM

Why can t you spray the oil poly?
- RichTaylor

Because unlike other finishes the oil over-spray does not dry before it hits the ground. So you are left with a sticky oily mess that is impossible to get rid of

View CharlesA's profile

CharlesA

3294 posts in 1636 days


#7 posted 07-11-2017 08:05 PM

One of the advantages of waterborne poly is that there is no color change, so if you get the color you like with your oil/shellac concoction, it will stay that color with the topcoat. I often do color with various shades of shellac and then he topcoat.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View OSU55's profile

OSU55

1426 posts in 1828 days


#8 posted 07-12-2017 04:05 PM

I dont spray ob poly due to overspray either, and pre cat laq cant be sprayed in a nonvented area in cool weather, so I moved to wb finishes also. A couple of other options, no need for tung oil:

Just spray shellac. Enough to build a little film. You can get different colors, or use a more pale color and use Transtint for the coloring. The shellac will provide the chatoyance, or shimmer, that wb doesnt have.

For more intense color, Target Coatings WR4000 is a wb oil emulsion stain base that provides some chatoyance. Can be colored with Transttint or purchased in a color. I usually then spray a toner coat of tinted shellac to even out and give more intensity, as well as more chatoyance.

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