Best topcoat depends on surface you are finishing. For interior house walls, best topcoat is premium 100 percent acrylic latex paint in satin or eggshell finish from brands like Benjamin Moore Regal Select, Aura, Sherwin Williams Duration or Emerald, or Behr Marquee, as they are washable, durable, low odor, and last 7 to 10 years. For exterior house, best topcoat is premium exterior acrylic like Sherwin Williams Duration Exterior or Benjamin Moore Aura Exterior with UV and mildew resistance, lasting 7 to 10 years. For interior wood trim, cabinets, and furniture, best topcoat to protect paint is water based polyurethane like General Finishes High Performance Topcoat or Minwax Polycrylic, which is clear, non-yellowing, and hard. For wood floors, best is Bona Traffic HD water based floor finish or oil based polyurethane. For automotive, best topcoat is 2K urethane clear coat with hardener, such as SprayMax 2K or professional automotive clear, providing gloss and UV protection lasting many years. For nails, best topcoat is Seche Vite Dry Fast Top Coat for regular polish or gel topcoat like OPI Gel for long wear lasting weeks. So best varies, but for walls premium acrylic, for wood polyurethane, for cars 2K clear, for nails Seche Vite.
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