Osmosis can cause filtered water to remain between the paint and fibreglass, creating bubbles in the pool wall.
Over time top gel coat paint can start to pulverise or granulate looking chalky
Cracks can be a serious issue, cracks can worsen you pool if water filters in or out of crack lines in the gel coating.
A difference in internal and external pressure can cause the pool walls to bulge.
Pool liners can lose their seal and separate from the pool base, causing it to float.
Leaks can occur anywhere in a pool, and can be caused by a number of factors.