Skeg fixture in hull contructiion

[Sarisha]

I have a Bavaria 47 Ocean, Yr 2000. What is the composition of the mortar anchoring the skeg, (aka P bracket, stem), shaft support into the hull. The skeg appears glassed in and fixed with 2 pins through the top, in a dome of mortar, then fibre glassed over. The mortar looks like, but doesn't appear to be concrete, not as brittle and stronger. Maybe epoxy or fibre glass mix?

[symphony2]

That is a pretty standard way of securing a P bracket into the hull. Don't know the exact details of the filler in the laminate but it definitely won't be concrete but probably a polyester based filler compatible with the GRP layup.