Spar Urethane wood sealer removal

First experience with this product.

Anyone ever strip it or a Spar Urethane sealer before?
Last time I did something similar it was not a pleasant experience but I’d like to help out a neighbor. Looking for some reccomendations on the stripper options as well as techniques to ease my pain!

I have stripped countless doors and windows with this product back in my days as a varnisher in the VI. Never using PW equipment though, it was all with brushes and a mix of toulene/methanol. Same things that Stripeze is made of. Applied it, let it dwell for 20 minutes, scraped, applied again. Neutralized with mineral spirits, sanded, stained, refinished with a higher quality topcoat. I’m not sure if that will help, but I know this product pretty well

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He has it on a large outdoor deck. He said it’s at least 5 layers. 30 years old.

Oh man, yeah that sounds like an absolute mess!

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Maybe a drum sander would be the better option?

Yea it does, but I dont think I like my neighbors that much lol. I’m going to test spot 2 heavy degreasers and that orange stuff from southside(cus its laying around in my garage) if I dont have any luck I’m passing. Just too much work and I’m not going insane, it’s already super busy.

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You’d be better off trying Sodium Hydroxide before a degreaser. Menards has small containers of it in the plumbing department by the Drano to where you can at least test it. You can order any amount of eBay or I’ll mail you some. Mix 8-12 oz per gallon. Be sure to add it to the water and not water to the powder. Mix in an open bucket at first. Once it settles down you can use a pump up.

@MDA1775 Mark would probably know the best way to go about stripping that stuff.


Urethane is out of my lane. Probably requires a solvent type stripper.
Here’s a good explanation of various stripper’s and their uses.


Did you try it out yet?

It isn’t the traffic pattern areas that I would be concerned about, it is the non traffic pattern areas. Corners and underneath rails, that is where 2 things happen, inexperienced people don’t spread the coating out evenly, and they don’t sand well enough between coats. THose areas may have a large buildup. urethane is great on wood exposed to the sun.

If going mechanical rent a large random orbital (50-60 a day in a lot of areas) the sandpaper is expensive, don’t buy/rent extra pads unless they allow returns. 36 grit paper, no higher than 60 grit. if they have one with the vac bag get it, they make lots of dust. just remember you gotta put the screw/nail heads down first or you will watch that expensive sandpaper get shredded.