Originally Posted by Fstbttms
It looks like the Petit Zinc Barnacle Barrier spray.
I believe you're correct - to be honest, I can't recall, for certain...
I had definitely coated the strut with West epoxy and copper additive as a primer... but I think I had sprayed it with Barnacle Barrier, having also done so to the wire I ran between my keel and rudder...
In any event, I was definitely underwhelmed by the performance of Barnacle Barrier in my home waters :-)