This problem has happened to three boats in quick succession, having hever happened on 50 plus boats prior to this, using this adhesive.
The alloy track is bonded to the back face of the carbon one piece masts using Plexus structural adhesive which is a methacrylate specifically designed for this this sort of bond. We have traced the problem back to uneven mixing by the two part system prior to setting. We have fixed the other two boats with this problem and are working with Adel to fix his.
I have every confidence in the quality of the Plexus MA425 adhesive although we do not share the same enthusiasm for the mixing nozzles that they provide which do not always give a consistent mix. However, the colour of the mixed adhesive gives a clear indication whether or not it is mixed correctly and we now check this very carefully prior to gluing up. We have raised our concerns re the mixing nozzles with Plexus.
Best wishes,
Matt