: I just started the varnishing process on my Guillemot, using System Three's
: Spar Urethane Varnish over their epoxy. My question is this: Is it really
: necessary to sand between coats? I've seen previous posts that argue in
: favor of both sanding and not sanding. What are the benefits and pitfalls
: of each?

: Additionally, I'd like to get a "Satin" look on the final coat- are
: there any tricks to this?

Some paint manufacturers sell flatting agents for their varnish. Using one of these, if available, you can fine-tune the sheen by varying the proportions. System 3 probably private-labels somebody else's varnish, so a call to them might point you in the right direction. I would definitely not recommend using a generic flatting agent, or one from another manufacturer due to possible compatibility problems.