You may be able to get the old rubber fairing off without damage, depending on what glue was used. When I removed mine last year, I had to chisel it off in bits!
The recommended glue is Bostik 2402; your 2-part PVC glue may be similar but I'd go for the proper stuff, to maximise the chance of a successful job. It's important to sand the hull and the mating surface of the fairing before applying glue.