We have a 4m rigiflex with a Honda BF40 on the back.
The rigiflex is a plastic double hull (airtight inside) and so the engine mouting bolts come through the outer layer of plastic, through the air inside of the hull and then out the 2nd piece of plastic before exiting through some reinforcement material on the inboard side.
Orange is hull plastic, grey the reinforcement material and blue the water.
The problem we have been having is that when coming off the water we have found the inner hull to have rather a lot of water inside it and we rather suspect it's the engine bolts that are submerged. The engineers say they have tightened and resealed but water is still getting in.
Do you have any suggestions as to how we stop this water?