Best long-lasting top coat depends on surface, house walls, wood, car, or nails. For interior house walls, best long-lasting top coat is high quality 100 percent acrylic latex paint in satin or semi-gloss finish from brands like Benjamin Moore Regal Select, Sherwin Williams Duration, or Behr Marquee, as these resist washing, scuffs, and fading and last 7 to 10 years. For exterior house, best long-lasting top coat is premium exterior acrylic paint with UV and mildew resistance like Sherwin Williams Duration Exterior or Benjamin Moore Aura Exterior, lasting 7 to 10 years. For interior wood trim, cabinets, and furniture, best long-lasting top coat is oil based polyurethane or water based polyurethane like Minwax, Varathane, or General Finishes High Performance, providing hard durable finish lasting many years. For floors, best is oil based polyurethane or Bona Traffic HD water based floor finish. For cars, best long-lasting top coat is 2K clear coat with hardener, such as automotive urethane clear coat, which provides UV protection and gloss lasting many years. For nails, best long-lasting top coat is gel top coat cured with UV light or long wear top coats like Seche Vite or Essie Good to Go. So best depends on surface but premium acrylic for walls and polyurethane for wood are most durable.
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