This is first time using this Varnish. It happened to be on hand and I need a good, strong Varnish. I need to lay down multiple coats. Is it necessary to scuff sand between all the coats, if I don't wait very long between them? I seem to remember with another type of Varnish, as long as I didn't wait too long between coats, it was OK to put another thin coat on without first scuff sanding and wiping off the dust. Don't mind doing it, if it's necessary, but don't like doing unnecessary work either. Thanks for any advice on this Varnish. Don M.