If the pool requires coating or sealants then ensure they are able to take the negative hydrostatic pressure
. As a good maintenance tip ensure that you have pool filters. Use them regularly so that the maintenance does not pile up. Keep a good water pump and pool heater. In case the pool has become very old then pool repair and restoration is the correct thing to do. The products that you chose should not deter the process i.e they should not chip, scratch or tear any part of the main body of the pool. Use a sealing system that will be the best line of defense for it. Fiber glass pool repair can be done effectively by coating products that work as good quality water proofing elements also.