Yes we have followed the directions and applied the 90 to both surfaces. (We are building Tog's Bird Dogs) It is easier to control where it goes. It goes down in amost pencil like lines. As long as you spray lightly and sparingly it covers well and goes where you want it with very little overspray.
I may have to check and see if my partners wife has the old 77 available. Just so long as it is free as well.
Free is good when you are a teacher in a school district that can't even supply you with copy paper for your classroom.