There goes to show you two different schools of thought. The Morganwreck and the Coffer. Why not varnish first and then have the best of both worlds. Yes the sandarac lavender varnish is the only way to go. I have noticed at a certain angle my tintypes have a flare or metalic look that I don't find very appealing. But I find varnishing even easier than flowing the plate and it adds even more to the aesthetic. At Coffer's we would shoot all day long and then after dinner varnish plates by oil lamp way into the night. Again I guess it is just a matter of taste, but I do know some people who just can't get the hang of varnishing or hate that step for some reason.