Finishing for Gears

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Forum topic by becikeja posted 10-24-2021 11:30 PM 289 views 0 times favorited 4 replies Add to Favorites Watch
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1181 posts in 4100 days

10-24-2021 11:30 PM

Working on a project that has several gears. Has taken forever to get the gears to all mesh correctly.
Now I need to add a finish, I think?? I typically finish my pieces with 3 coats of Arm-R-Seal high gloss. I’m a little worried that the Arm-R-Seal will impact the gear alignment, and am thinking about using BLO instead. Any thoughts? And if using BLO do you just apply it straight, or do you need to mix it with something?

-- Don't outsmart your common sense

4 replies so far

View Lazyman's profile


8258 posts in 2674 days

#1 posted 10-25-2021 03:09 AM

Mathias Wandel over at recommends water based poly. IIRC, he says it makes them more slippery so that they mesh more smoothly.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View MakeThings's profile


85 posts in 861 days

#2 posted 10-25-2021 08:18 AM

I’ve used polyurethane without any problems.

Does the project have to have a finish? Most of the gears I’ve made were more utilitarian in nature. Are you worried about the impact of using the gears on the teeth (ware and tear)? I’ve heard adding a little glue on the edges toughens the gears up if that’s what you’re after.

-- Most of my public projects:

View becikeja's profile


1181 posts in 4100 days

#3 posted 10-25-2021 10:36 AM

Not worried about the gears holding up over time, more for appearance.

-- Don't outsmart your common sense

View OSU55's profile


2900 posts in 3276 days

#4 posted 10-27-2021 08:53 PM

3 coats of poly full viscosity would probably cause a problem. Thin the ars ~25%, flood it on the gears for 10 min keep it wet, wipe it off. Go back in 30 min to wipe off the bleed out. After a few hours apply a light wipe on coat. Add coats to the gear sides but not the teeth to achieve gloss. After cure paste wax all the surfaces.

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