Yes, recently reinstalled me stern rubber, whilst boat was in the water.
Used about 8x (300ml) tubes of Sika 291 marine adhesive.
Biggest job was cleaning old adhesive off boat & inside of the rubber, and preparing surfaces.
After mechanically removing old sealant, used a xylene based product to clean & prepare surfaced.
Started at the centre, using the Stainless steel u bracket, and applied sealant to the inside of the rubber, before installing one half at a time.
You will need to have some masking tape handy to keep the rubber stretched whilst the sealant hardens, to prevent the rubber from shrinking away form the gunwhale end cap.
It looks more daunting than it really is.
Good luck.
Steven
SV Konan the Bavarian