Fixing Runs in Conversion Varnish
Tips on using a razor blade to clean up runs in the finish. April 17, 2010
I have used CV for the first time and the item has several runs in it. I'm guilty of spraying too heavy, but it's too late now. Can anyone give me some advice? Can I sand these out (with what grit) and spray a lighter coat? I started out with a gun that wouldn't spray it and switched to one that sprayed too much.
From contributor F:
Take a razor and start to shave off the runs. When you get them nice and smooth, sand with 220 the whole surface and recoat.
From contributor D:
A razor blade will work, but my main concern would be Mil thickness of the existing coating. Exceeding the manufacturer’s suggested film thickness can result in film checking, crazing, cracking and flaking. In which case, the runs would look pretty good in comparison.
From contributor R:
The issues contributor D talks about are rare. Just use the razor blade in the direction of the grain, sand with some 320, then go over that sanding with a super fine sanding sponge, & reshoot. Remember to keep the finish room and sprayed product at up 70 degrees while spraying and for 24 hours afterwards...that is the mistake that will usually be the downfall of CV.
From contributor P:
If you get to the runs when the finish is still soft, but not sticky, then shaving them with a razor works well. Once the finish hardens, it's easier to use the razor like a scraper.
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Knowledge Base
KnowledgeBase: Finishing: General Wood Finishing
All rights reserved. No part of this publication may be reproduced in
any manner without permission of the Editor.
Review WOODWEB's Copyright Policy.
The editors, writers, and staff at WOODWEB try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at WOODWEB after considerate evaluation,
and at their own risk.
335 Bedell Road
Montrose, PA 18801
Copyright © 1996-2016 - WOODWEB ® Inc.