Glass tape and resin can be painted with automotive paint. As far as the bonding properties with FRP, I don't know, haven't worked with it, you might want to check it out with the technical staff at west systems. www.westsystems.com They got right back to me with questions that I had. Doug Hodder
Scruffy
A lot or truck dry boxes have FRP sides and at our truck shop we have been repairing and painting then for years with no problems. If you use FRP panels I would do your glassing using SMC compatible resin incase the material is made with SMC resin. If you use regular resin it will separate over short time.