my floor is holding up well so far and had a couple of cars in for service too no issues with paint failing.
the PVA is used to seal the floor a bit and give the new paint something to bond with, i would maybe do x2 coats of PVA 10 parts water to 1 part PVA leave 24hrs between each coat. Then paint with the floor paint. give the paint time to cure fully in cooler temps this can take 5-7 days.
you should be good then. 2012 Vogue 4.4 TDV8 - Current
2014 Navara V6 - Gone
2004 Vogue TD6 - Gone
Grand Cherokee - Gone
Discovery V8 (LPG) - Gone
Discovery TD5 - Gone