Yes you can. To do this you must know what chemicals you are using. Perth Fibreglass Pools uses only the best quality resins to acheive the best results. Fibretech Vinyl ester resins and the AQUAGAURD top coat system is the market leader.
An added benefit to resurfacing a concrete pool is that the fibreglass acts as a natural insulator allowing the pool to warm up a few more degrees than before.
Warmer pools = Happier summers!