5200 is great - but don't ever plan on separating them again. I've just researched, and with some advice from the I20 guys, am getting ready to seat the beams on my new Nacra F18. This is a common practice on the Inter-style cross beams.

They recommend using an epoxy / micro-balloon slurry in order to seat the beam. It forms a very hard surface but will not adhere strongly to the beam. The point is to make a socket that is precisely shaped to the beam. To futher encourage release of the beam if you ever need it, you can wax it with a mold release wax before seating it. One other tip given to me was to put a bead of sealant (3M 4200 that is removable) around the perimeter of the joint before joining in order to give a good appearance post cure. Also watch that you don't get epoxy on the beam to hull bolts either or you'll never be able to tighten them. The step by step should be as follows:

- unassemble hull / beam
- clean both joining areas with mineral spirits or acetone
- mask off the area thoroughly
- wax aluminum beam area
- apply a dam of 4200 around perimeter of joint and around bolt holes
- mix up epoxy slurry to a 'thin peanut butter' consistency
- apply epoxy to joint area
- rebolt beam in place snugly (not full strength)
- clean up perimeter and remove excess epoxy / adhesive using mineral spirits (mineral spirits cleans up 4200 and 5200 very well). Rubbing Alcohol cleans up the epoxy very well.
- after epoxy cures, tighten beam bolts to manufacturer specifications.