Join Date: Mar 2003
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Best keel fairing material
There are several approaches that we used in my boatyard.
The easiest is to clean out the keep seam of cracking or loose filler, sand and fair the bottom paint along the seam and apply a bead of caulking in the seam (3M 4200 or 101 is fine) and paint over.When you clean out the old filler, leave it open to drain as long as possible - several weeks if you can. We would sometimes brush or syringe some acetone into the seam to aid in drawing the moisture out.
Bear in mind that there will always be some movement in that area.
For more severe opening along the seam, we would grind out along the seam(go 3- 6 inches up along each side), remove loose caulking, and fill with Vinyester mixed with compatible filler, sand to fair the seam out and paint. In some cases, we used several layers of fiberglass cloth along the seam to avoid cracking.
I would advise that you have the keel bolts checked to make sure they are tight. Check with the manufacturer on the correct torque. This should be done while the boat is hanging in the straps of the travel lift. Over time, some bolts loosen very slightly.
By your description, it sounds like your situation is very routine and the simpler solution may very well be fine.