How I Painted The Interior of My Vintage Boler Travel Trailer & What I Used
Cleaning: I used dish soap and warm water to wipe everything down. I then used XXX which is an alternative option to TSP and does not need to be rinsed off.
Filling Holes: I used Gorilla Glue 5 Minute Epoxy glue to fill all of the holes in fibreglass cabinetry. For the larger holes or holes that are on the bottom of a cabinet (and the glue would just slide off) I used painters tape. The glue didn't seem to stick to to the tape and it would leave a nice flat surface. However, I found that with tape it was easy for air bubbles to get in and I would have to go over it a few times so it was easier on the smaller ones to not use tape. I went over the holes two or three times (a day apart to allow it it fully dry) until they were completely filled. I then sanded the holes with and electric sander until the excess glue came off and I was left with a smooth patch.
Painting Prep: Fist, I removed all doors and hardware that could be removed. I sanded down all of the shiny surfaces with an electric sander. This really helped to prep the surfaces for painting. It removed any dirt, stains and cosmetic blemishes in the surface. I then vacuumed, cleaned all the surfaces (again) and used painters tape to cover anything I didn't want to get paint on.
Painting: For the primmer, I used Bulls Eye 321 Primer and did two coats on the skin and cabinetry. I think that it's import to do two coats because it is very thin and doesn't cover everywhere the first time. For the top coat I went with Behr High Gloss Enamel finish paint in pure white for the cabinetry and the skin. I also painted the back of the existing cabinet doors that I wanted to incorporate in the new design. I used a small foam roller primarily with a 1.5" trim brush for cutting and the edges.
Tips: I suggest giving yourself lots of time. It took me so much longer than I imaged it would. I figured that a small space would be super easy but it actually took forever.