I paint cars as a hobby...Iam not a professional. If your trailer is in good shape outside, before you sand with anything, I suggest you you wash it down with a good detergent dishwashing, ot simple green, after buy a gallon of silicone and other contaminents remover made by dupont, use ultra clean rags..wipe it down a few times. then sand. Start with 180 grit wet and dry sand paper,using a lot of water, sand until the shine is gone. start again with 320 grit and do it again, do not put your hands on it, after it drys, the oils from your skin will contaminate the
fiberglass and could create fisheyes. buy a good primer that is
fiberglass friendly, tack rag the surface first, then spray on, allow to dry, and sand again with 320 grit, some primers do not require sanding, but have to be topcoated (painted )within a certain time limit., use a good paint like dupont centari, or ditzler, expect to pay 100 bucks a gallon . choose an hvlp paint gun with a 1.5mm tip, that will save you money Good luck Paul
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