can this be used on painted surfaces (tables, chairs..) for outdoor protecton and easy cleaning? and is it really clear, so won't change the color?

Yes. I have done this several times. Note that it may change the color slightly (a little yellowish), but it makes the finish much more durable. I recommend a satin or semi-gloss if you want a smooth finish. I've used matte before as well, where I wanted to make the surface a little rougher (distressed furniture, or stairs on a ladder).

Can this bbe thinned to get a smooth finish?

i do not know, i did not try but if you use a hi quality brush its not too bad . I found brush it out 1 time and do not go back over it an the finish is acceptable

I have a table that has a cut out groove all the way around (which i hate). if i use this on top of a gel stain to refinish, will it fill that groove?

My experience with the product was that if it collected heavy in a crack or around a metal fastener, it dried pretty white rather than clear, so I would expect it to not be clear in the groove

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Rust-Oleum 284472 Varathane Triple Thick Polyurethane, Semi-Gloss

Product ID: 86298792

Details

Brand
Varathane
Finish type
Semi-Gloss
Item weight
422 g
Material
Polyurethane
Recommended uses for product
Interior

🎨Semi-gloss finish enhances wood beauty

⏱️Dries in 2 hours

🛡️3X thicker for ultimate durability

23.34 OMR

Duties & taxes included

In stock

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Description

🛠️ Triple Thick Protection, Triple Fast Finish – Because Your Wood Deserves the Best!

ONE COAT WONDER - Complete your wood projects 3X faster with just one thick, flawless coat.
FAST DRY FORMULA - Touch dry in just 2 hours—perfect for busy pros who can’t wait to move on.
COVERAGE CHAMPION - Covers up to 50 sq ft per quart, maximizing efficiency and minimizing waste.
SHOW STOPPING FINISH - Semi-gloss sheen that elevates the natural grain and warmth of your wood surfaces.
SCRATCH STAIN SHIELD - Water-based formula delivers superior resistance to everyday wear and tear.

Rust-Oleum Varathane Triple Thick Polyurethane is a premium water-based wood finish that offers 3X the thickness of traditional polyurethanes. Designed for interior wood surfaces, it provides exceptional scratch and stain resistance with a durable semi-gloss finish. Dries to the touch in 2 hours and covers up to 50 sq ft per quart, enabling faster project completion with just one coat.

Specifications

ASIN	B00RWWCJHQ
Best Sellers Rank	91,164 in DIY & Tools ( See Top 100 in DIY & Tools ) 220 in Varnish
Brand	Varathane
Compatible Material	Wood
Coverage	250-300 sq ft/quart
Customer Reviews	4.6 4.6 out of 5 stars (275)
Finish	Semi-Gloss
Global Trade Identification Number	00020066273682
Included Components	1-Quart Polyurethane
Item Form	Liquid
Item Type Name	Triple Thick Polyurethane
Item Weight	422 g
Liquid Volume	32 Fluid Ounces
Manufacturer	Rust-Oleum
Material	Polyurethane (PU)
Model Number	284472
Number of Items	1
Part Number	284472
Recommended Uses For Product	Interior
UPC	020066273682
Unit Count	1.0 count

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