All of these posts talk about waxing with Renaissance wax. Are you talking about View Camera magazine?

I'm hanging a show today that has 6 waxed vellum prints in it, and it does add a little bit of kick without changing the character of a pt/pd print. Here's a short blog post on a little bit of the process I'm going through for the waxed prints: http://www.anonymousvernacular.com/2...tpd-on-vellum/

As Mike wrote, there are many posts about waxing that can be found through the search function, you can even go as specific as searching for "Renaissance Wax" which pulled up these three posts:
http://www.apug.org/forums/forum42/2...-ever-try.html
http://www.apug.org/forums/forum205/...any-ideas.html
http://www.apug.org/forums/forum46/5...ng-prints.html