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      The future of the JD Forum   07/31/18

      Thank you all for your participation on the JD Forums.  We have enjoyed answering your questions, providing project advice and technical assistance on this forum for a number of years. We believe that there are now better ways to provide this service for our customers and the community. With that in mind, we have made the difficult decision to discontinue the Jamestown Distributors Forum.   Our JD Tech Team is committed to being your trusted technical resource, and we encourage you to reach out via email, phone, social, product reviews, and to post questions using the Q & A 'Ask A Question' function on all product pages. Additional information can also be found on product page Technical Data Sheets (including detailed usage instructions and application data).   Thank You Jamestown Distributors 
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RickW

Applying over old varnish

5 posts in this topic

You can put new varnish over existing varnish if it is in good shape.  That would be without areas of failure, otherwise the failed areas when sanded will be down to bare wood and it would show through the new finish.  You need to know what the old varnish is, a straight spar varnish or a two part.  You should not put a different type on the old varnish.  Sand the old varnish first, tack off, and apply the new finish.

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What's the best technique for removing and repairing runs that have cured? It's easy to sand them out, but it's difficult to feather in fresh varnish so that it blends in with the surrounding dried varnish. Any tips for doing this? I work with marine type spar varnish, not urethanes. 

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Sanding runs is the easiest to do.  When reapplying, thin the varnish with the recommended thinner and tip the edges thin to avoid seeing it.

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If the varnish is fully cured and you have a really sharp scraper, you can remove the runs, sand the entire surface with 320 and then apply a final coat that will be free of runs. If you use sandpaper you run( pun intended) the risk of accidentally sanding too much and creating bare spots.

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