I've got a bit of a water leak in the boot of the tin-top and some panels to fix on the interior of the dax that need sealed with something that fairly easy to remove later (ie. not PU adhesive) but something a bit better than bathroom silicon would be nice

Anyone got an recommendations ?

Im a big fan of Dow Corning, very good sealant.

I like loctite 595 silicone, you can buy it in small 40ml tubes or full 330ml cartridges

http://www.screwfix.com/p/no-nonsense-11667502-general-purpose-silicone-clear-310ml/35887

There's only one sealant that anyone needs, the marine industry stays afloat on it.

PU. Sticks better than the proverbial to a blanket. Cleans up with white spirit or turps.

Available at Toolstation as Puraflex 40.

http://www.toolstation.com/shop/Adhesives+%26+Sealants/d180/General+Sealants/sd2350/Polyurethane+PU40+Sealant+300ml/p67949

Cheers,
Nev.