The thing is most resins also don't bond to mast tracks, they rely on mechanical grooves in the track.

The only way I can think that may work (no guarantees) is to get a slab of high density closed cell foam, i.e 80 kg/cm3 divinycell. I would say about 100mm bigger than your track all the way around and about 20mm deeper. If you set that into the board, sand the Polyethylene back with a very coarse sander, so that the epoxy has 1/2 a chance of getting a mechanical grip, it may work.
Your then relying on the high density plug to take the load instead of the epoxy/polyethylene bond. The deeper the block is the better, you could even take it all the way to the bottom layer of poly'.
Not sure what sort of foam is in the Wayler, but if it's open cell, make sure there's no voids in the join to the high density block, xcause if the resin doesn't stick to the poly' it'll suck water for sure.

quote:

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Originally posted by jmac

it has a fixed hole in it for the mast? I had an old board a while ago that was about 25yrs old but it had a mast track - I made up a little retaining bit out of plastic and used it at the bottom of the track to hold in one of the new mast bases....
that track was held in with aluminium blocks under the PE shell which were then tapped out I think

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I think he's referring to newer sails being suited to a mast track further back on the board than the older sails which were suited to boards which had mast tracks further forward.

The Wayler has a slot on the deck about the size of a tuttle box and the mast base slots into this with an interference fit.

The problem is that the existing mast base has no downhaul system, so I can't get the required downhaul tension for a newer sail. I thought the easiest way to get around this would be to just put a modern mast track in the board, but I'm thinking now it might be better to modify the existing mast base so I can fit a modern downhaul system on it.

Jmac: the existing slot is secured to the board by a couple of screws. I might remove it to see if I can screw in a wooden block and maybe mount a chinook base plate on the block.