Questions tagged [polyurethane]

Polyurethane is a synthetic resin used in some modern finishes.

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9
votes
3answers
40k views

How do I de-nib polyurethane after it dries but still maintain its finish?

Sometimes when I apply polyurethane, for whatever reason, it's not completely smooth. Maybe a brush mark here and there, or a couple little nibs, etc. The advice I see often is to sand the area ...
8
votes
5answers
393 views

I polyed my paintbrush then procrastination left me in a predicament

I was using a nice paintbrush with polyurethane and it seems that I set it down then forgot to clean it. I have since run into it and I have a shiny, relativity tough, paintbrush now. Needless to say ...
6
votes
1answer
2k views

What is the difference between wiping polyurethane and wiping varnish?

I make my own wiping polyurethane by thinning regular oil-based poly from home improvement stores with mineral spirits. According to Bob Flexner, the only difference between this and polyurethane-...
6
votes
2answers
15k views

Polyurethane clear coat is thickening to a jelly in the can!

I've been refinishing wood cabinet doors. I've sanded down to the bare wood, then applied a pre-stain. After 1 coat of stain I'm putting on 2-3 coats of polyurethane clear coat. I'm using mineral ...
5
votes
1answer
1k views

Flat polyurethane finish for tabletop

To protect a reclaimed table top, could I use gloss poly as the first coat and then top it off with a flat poly? I've heard that gloss gives better protection, but I want a flat finish.
4
votes
1answer
4k views

Didn't let wood dry between coats of stain & poly. How to correct?

I attempted my first ever woodworking project this weekend and thought it was going smoothly until I realized I was supposed to let the minwax oil based stain dry for 4-6 hours between coats. I had ...
3
votes
2answers
3k views

A beginner's question about sanding, stain, and polyurethane for a SMOOTH finish

I'm doing to hobby pieces using 3/4" pine ply. On my faces, I've sanded with 80, then 120, then finish with 220 using random orbit sander. To the touch, it's very very smooth. I'll give it a good ...
3
votes
2answers
739 views

How are bubbles avoided when brushing on Polyurethane?

I have used polyurethane a few times. Each time I've tried to be more careful about creating bubbles, but the finish was still riddled with bubbles. Just the act of dipping the brush in the can and ...
2
votes
1answer
3k views

When can I sand water based polyurethane?

I've applied Water Based Varathane Ultimate Polyurethane to some desktops. I intend to apply 3 coats. The instructions say drying time is 2 hours. Can I sand the finish after 2 hours or do I have to ...
1
vote
2answers
515 views

Polyurethane a box (vertical sides)

I was originally going to use spray lacquer for my speaker cabinets which are essentially large cubes. However, I've switched to brush on Poly. Is it possible for me to apply the poly on the ...
1
vote
1answer
147 views

Moisture Blushing or Inadequately Mixed Satin Wipe-On Poly?

In the final step of finishing my speakers I was putting satin wipe-on poly over my danish oil. The danish oil sat for 6 days on my walnut paperbacked veneer in my basement with a dehumidifier going. ...
0
votes
1answer
151 views

Spray on Lacquer for Vertical Surface

I have a rectangular speaker cabinet (basically a box). Can I use spray lacquer and spray all sides at once? Otherwise I have to account for a lot of overspray.
0
votes
2answers
178 views

Recommended finish for workbench vise

I made a small tabletop Moxon vise and after some research decided to finish it using a 3-part mix of equal parts polyurethane, boiled linseed oil, and mineral spirits. Sounds okay to me, but I'd like ...