daniel: below are my person 'definitions and uses' with the products discussed - 5200 - below waterline applications. use for fittings you will _never_ (essentially) remove. 5200 is excellent and 'permenant' adhesive and sealant. 4200 - above waterline applications. a challenge to remove but can be done (carefully so as not to damage the surface ... ie the gelcoat) 4200 is an a sealant and a good adhesive. Life Calk - above waterline applications. not difficult to remove but you must re-bed your hardware more often than with 4200. life calk is a sealant and a weak adhesive. :: Dave Scobie :: M17 #375 - SWEET PEA - www.m17-375.webs.com :: Sage Marine - www.sagemarine.us --- On Mon, 2/21/11, Daniel Rich <danielgrich@gmail.com> wrote: Why not 4200? 5200 seems to weak. Daniel