Can this product be applied to painted surfaces.

I have used it over wood carvings painted with acrylic paints and have have excellent results in an outdoor evironment.

can i apply the oil based urethane over a water based paint to protect it?

You can but this is why you should use a water based poly over the oil poly Oil based poly has an amber hue, whereas water based poly is clear. An oil based polyurethane will continue to amber and darken over time, while water based poly will remain clear for the lifetime of the hardwood floor. ... Water based poly dries much faster, and several coats (up to 4) can be applied in one day. This explains why fritz the cat who did answer this question as well is why theirs yellowed

How is the viscocity out of the can, is it more like warm syrup or more like water...or somewhere in between? Thank you!

Maybe Slightly Thinner than warm Syrup, So probably between Warm Syrup & Water. A word of advice though, I had an extremely difficult time working with this product & had to sand and reapply many coats to get a satisfactory finish. It dries fast & if you run a brush over it after is has sat more than a minute it will create rough brush marks. Additionally if you apply more than a very thin layer it will crack similar to a crackle pattern. Unless you are putting this over a pure white background I would recommend that you use the standard "Crystal Clear" non-water based urethane. It has only a light yellow tint and is much easier to work with in my experience.

Can this product be applied over an exterior wood stain?

In fact it can, but being unfamiliar with the product, I purchase it thinking that it's use would result in a shine. I learned that "spar" must mean something other than gloss or high gloss. I then purchased the "Minwax Gloss aerosol which gave me the desired result, although several coats were required.

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✨ Elevate your wood game with a finish that works as hard as you do!

EASY CLEANUP - Water-based formula dries fast and cleans up effortlessly with warm water
FLEXIBLE FINISH - Special oils let your wood expand & contract with seasonal changes
YEAR ROUND SHIELD - Protects wood from rain, moisture & sun damage with UV blockers
CRYSTAL CLEAR GLOSS - Enhances natural wood beauty with a sleek, modern sheen
VERSATILE APPLICATION - Perfect for doors, trim, countertops & outdoor furniture

Minwax Helmsman Water Based Spar Urethane is a premium, water-based protective finish designed for both interior and exterior wood surfaces. Featuring UV blockers and moisture resistance, it safeguards wood against sun fading, rain, and temperature fluctuations while delivering a durable, crystal clear gloss. Ideal for a variety of projects, it dries quickly and cleans up easily, making it the go-to choice for professionals and DIYers aiming for flawless, long-lasting results.

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Coverage	12 sq ft/quart
Recommended uses for product	outdoor
Liquid volume	32 Fluid Ounces
Item form	Liquid
Global Trade Identification Number	00027426630505
Manufacturer	Minwax
UPC	027426630505
Part number	630500444
Item Weight	1.02 Kilograms
Product Dimensions	12.7 x 12.7 x 12.7 cm; 1.02 kg
Item model number	630500444
Size	1 Quart
Color	Gloss
Style	Gloss (Water Based)
Finish	Gloss
Pattern	Urethane
Item Package Quantity	1
Included components	Minwax Helmsman Water Based Spar Urethane, Quart, Gloss
Batteries Included?	No
Batteries Required?	No

MinwaxHelmsman Water Based Spar Urethane, Quart, Gloss

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