I agree that Semco has to be reapplied every 4 to 6 months; however, the advantage of using it is that there is no surface prep involved. Just wash, allow to dry, and recoat. Anyone who has a Beneteau with the teak seating surfaces can attest to the difficulty in the surface prep involved with the teak slats & black caulking between the slats. Just apply the semco with a disposable brush and wipe any flash that gets on the caulking with a rag. The previous owner let is go gray; however, the teak surfaces were getting rough and grooved. After sanding and sealing with Semco, it is looking fairly good. Not as nice a finish as varnish; however, a lot less work. If I ever do decide to go to a varnish or cetol finish, Sunbrella covers would be necessary to prevent the arduous task of stripping and recoating the seating surfaces.