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Finishing Tips: Understanding the Difference Between Polyurethane and Polycrylic
Oil and water don't mix
By Rain Noe - October 14, 2020
I'm currently building a Murphy Bed from a DIY hardware kit. This is the third I've built but the first in an enclosed cabinet, and all of the plywood pieces you need to produce mean there's a lot of finishing required. I absolutely hate applying finish.
For years MixWax's Fast-Drying Polyurethane has been my go-to for any cabinetry or furniture project, and I even used to use it for the floors of my old photo studio. I wouldn't recommend it for high-traffic flooring situations, but other than that it's reasonably durable.
What I hate is that it's oil-based, which means you have to clean the brushes with mineral spirits (those disposable foam brushes won't cut it here). I've got this down to a fairly non-messy science--but it takes freaking forever and the fumes are awful. So I think once the current pieces are cured, I may switch to Polycrylic for the others.
I was poking around for a good explanation from an end-user on the practical differences between Polyurethane and Polycrylic, and sat through some bad and misguided videos before I finally found this informative, straight-to-the-point explanation by the Welcome to the Woods channel:
Enter a caption (optional)
As someone who sits through a lot of DIY YouTube videos, this is an example of a good one, because the host avoids all the "Don'ts" of a bad DIY video. I'll list those "Don'ts" below:
- Don't spend the first two minutes of the video re-hashing what the problem is. We already know what the problem is, that's why we came.
- Don't give us a long intro sequence, as if we're watching the opening credits of a 1950s TV show.
- Don't use shaky handheld camera footage.
- Please don't add music, and especially not at a volume that obscures the dialogue. The chances that we viewers all love your preferred genre of music is slim.
If any of you have additional tips on Polyurethane vs. Polycrylic, I'm all ears. Also, if you've got a preferred finish manufacturer other than MinWax--they always seem to be the only brand I can get locally, so I use them out of incumbency, not loyalty--please sound off.
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Rain Noe
I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.
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Finishing Tips: Understanding the Difference Between Polyurethane and Polycrylic
I'll also add that water base finishes can dry very quickly - large surfaces can be a challenge keeping a wet edge. That can be nice though for smaller projects or parts because they can be turned around so much more quickly - a real advantage in a small shop with limited real-estate for leaving parts spread out to cure. And that fast drying also means less time for dust and airborne contaminants to settle into an uncured finish.
oil base finishes will amber a light colored wood. water based doesn't, but in my opinion looks terrible on medium and dark colored wood. on walnut? completely unacceptable, looks like chocolate milk. cherry and red oak? hope you like pink!
I'm curious about the differences in strength between wipe-on polyurethane and regular polyurethane. I tend to use wipe on (and it takes about four coats), but so far, looks/feels nice. Is there a huge difference between the two?