At the end of a wonderful week of canoeing the water trails on Klamath Lake Oregon, I pulled my 16' Faber onto a dock. A screw head on the dock gouged a scratch into the bottom of the canoe about 3" long by 1/4" wide. Half the length of the scratch is down to the primer coat but the second half is down to the canvas. Close inspection reveals that the canvas is not torn. My question is how to best repair this. The canoe is currently on its rack and will not touch water until it is fixed. Hopefully there is a relatively quick fix as the canoeing season in the Pacific Northwest is prime right now. One aquaintance suggested using 3M Marine Adhesive Sealant 5200 to fill the void up to the primer level, smooth it out with a putty knife, let it cure and paint. This seems not quite right to me, but my experience with this type of repair is minimal at best, so I am laying this one down for the greater collective knowledge to help me out with this problem.