For me, it's the feel. When wet sanding with 400 grit paper, varnish feels soapy. Once I get through the varnish and it's just epoxy, the soapy feel goes away. Also, if the varnish is relatively new, there's a change in the smell, but that's pretty subtle and not always there.
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RE: Restoration is on hold until O learn this............
» Submitted by Laszlo - Fri, 7/19/19 » 12:01 AM
For me, it's the feel. When wet sanding with 400 grit paper, varnish feels soapy. Once I get through the varnish and it's just epoxy, the soapy feel goes away. Also, if the varnish is relatively new, there's a change in the smell, but that's pretty subtle and not always there.
Good luck,
Laszlo