by KCStudly » Thu May 21, 2015 6:45 am
Oil based polyurethane thinned with mineral spirits to help it soak in; "the mix".
Some people like to start real thin at 25 poly:75 spirits then move progressively thru 50:50, 75:25, finishing with full strength poly.
I have found that a ratio of 2 parts poly to 1 part spirits works well getting water to bead in one generous application (when tested on bent Okoume ply and cedar spars, both relatively soft woods); thinner just seems to take more coats.
Where I have wanted to back seal but still need to glue/adhere foam I did not build up so much that the surface became shiny; just 1 generous or 2 moderate applications. With no additional sanding or prep work, other than dusting off, the PL300 I am using to adhere the foam seems to be grabbing just fine (it is rubbery like caulk). Where I know I will be wrapping and/or gluing canvas, I have either left raw wood or will be sanding to provide tooth.
KC
My Build:
The Poet Creek Express Hybrid Foamie
Poet Creek Or Bust
Engineering the TLAR way - "That Looks About Right"
TnTTT ORIGINAL 200A LANTERN CLUB = "The 200A Gang"Green Lantern Corpsmen