Yep, i re-coated the firewall (front) after I got through drilling and mounting my YS 120 SC, also fuelproofed the inside, all around the fueltank and hatch, plus the backside of the firewall.

I also changed the landing gear mount bolts to 6-32, w/nylock nuts and larger flat washers. Just didn't like the supplied ones.

I kind of have my "favorite" hardware and pretty much use it on all my planes. Nothing against Mr. Patrick, just one of my quirks