Originally Posted by Cypman
Put silicone into each screw hole and all along the undrneath of the flange before positining and screwing down. Don't drill your pilot holes too small or you will crack and split the fibreglass gel-coat; though not too big or the screws won't hold!!! Regarding how many to use, I consider for a secure fix you need to space the screws circa 10cm to 15cm apart.
What size hole or drill size would you recommened for the 1 1/4" self tappers?
Theres loads of holes for the screws the whole way round the flange so maybe screw every 2nd one.
I was onto humber today and they said silicone with the screws wasn't enough ,they said to use sikaflex. Don't know what to do now wheather to use sikaflex or not? If i ever want to move the seat sikaflex will be a problem to get off.
If i use sikaflex what is the correct way to apply?
1. add sikaflex to the deck right around and then sit the flange and jockey down on it, then drill pilot holes put a bit of sikaflex in holes and screw in tappers.
2. add sikaflex to the bottom of jockey flange all way around then place jockey down on deck, drill pilot holes, screw in.
do you add sikaflex the whole way around or just in cornors or patches?