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Polyurethane Over Spar Varnish?

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Forum topic by Ron Ford posted 02-23-2014 05:24 PM 799 views 0 times favorited 10 replies Add to Favorites Watch
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Ron Ford

118 posts in 455 days


02-23-2014 05:24 PM

Topic tags/keywords: question

I just finished turning a segmented bowl that includes a number of pieces of redheart. I gave it a coat of sanding sealer, followed by a coat of spar varnish for its’ UV-resistant protection to keep the redheart from turning brown. Since spar varnish only comes in clear gloss, can I scuff it when it dries and apply a coat of satin polyurethane (or any other satin finish that anyone may recommend) over it?

Thanks,

Ron

-- Once in awhile I make something really great. Most days I just make sawdust.


10 replies so far

View Mark Kornell's profile

Mark Kornell

582 posts in 1254 days


#1 posted 02-24-2014 12:44 AM

Yes, you could. Or you could just rub the spar to a satin sheen using steel wool.

-- Mark Kornell, Kornell Wood Design

View Ron Ford's profile

Ron Ford

118 posts in 455 days


#2 posted 02-24-2014 12:53 AM

I hadn’t thought of that option, but it sure makes sense. I assume 0000 steel wool is the proper grade?

Thanks,

Ron

-- Once in awhile I make something really great. Most days I just make sawdust.

View Mark Kornell's profile

Mark Kornell

582 posts in 1254 days


#3 posted 02-24-2014 07:19 AM

Yup, 0000. Use a lubricant, too. Make sure the spar is completely dry or it won’t be hard enough to get an even sheen. Lots of articles on the net, but try http://www.woodworkersjournal.com/Main/Articles/Rubbing-Out-The-Final-Step-to-a-Great-Finish-5261.aspx

-- Mark Kornell, Kornell Wood Design

View Ron Ford's profile

Ron Ford

118 posts in 455 days


#4 posted 02-24-2014 02:10 PM

Thanks again, Mark. I appreciate the advice, and the article you directed me to was also very helpful.

I gave the bowl the first coat of spar varnish yesterday. I think I will let it dry another day before I give it another coat, then let it sit for a week or more before I try any further rubbing.

Ron

-- Once in awhile I make something really great. Most days I just make sawdust.

View woodchuckerNJ's profile

woodchuckerNJ

892 posts in 357 days


#5 posted 02-28-2014 01:08 PM

You realize that spar is for outdoors. It does not harden like poly.

Not sure how poly over spar is going to be, as the spar is softer your finish may not last long if you put poly over it.
I’m not certain, just pointing that out as a possibility that you may want to check out.

-- Jeff NJ

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HillbillyShooter

4827 posts in 1015 days


#6 posted 02-28-2014 01:17 PM

I wouldn’t for the reasons pointed out by Jeff—hard finish over a soft one.

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

View 49er's profile

49er

108 posts in 327 days


#7 posted 02-28-2014 02:51 PM

Thanks for the link Mark.

-- Correlation is not causation but I did loose my Doctor !!!

View Bill White's profile

Bill White

3540 posts in 2683 days


#8 posted 02-28-2014 03:04 PM

Wait more than a week before final rub-out. When it stops smelling like varnish it is cured and ready to rub.
Bill

-- bill@magraphics.us

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whope

53 posts in 1168 days


#9 posted 06-18-2014 03:34 PM

Ron,
How did this turn out?

Bill

-- Measure it with a micrometer, mark it with chalk, cut it with an axe.

View Ron Ford's profile

Ron Ford

118 posts in 455 days


#10 posted 06-18-2014 06:29 PM

Hi Bill – It worked out just fine. The finishes worked well together, and the colors of the wood are staying bright and vibrant.

Ron

-- Once in awhile I make something really great. Most days I just make sawdust.

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