What paint never comes off?

No paint truly never comes off, as all paints will eventually degrade, fade, or can be removed with aggressive methods, but some paints are extremely durable and close to permanent under normal conditions. The most permanent paints are two-part catalyzed coatings like epoxy paint used for garage floors, industrial floors, and marine applications, which cures to a very hard, chemical-resistant film that is extremely difficult to remove without grinding or shot blasting. Powder coating, which is electrostatically applied and baked in an oven, is also extremely durable and resistant to chipping and chemicals, requiring blasting to remove. Catalyzed urethane and polyurethane automotive clear coats are very hard and long lasting. Oil-based alkyd enamel on trim is also very durable and hard to strip. For house paint, high-quality exterior 100 percent acrylic can last 10 years but will eventually peel. So paints that are closest to never coming off are two-part epoxy, powder coating, and catalyzed urethane, which are industrial strength and require mechanical removal, but technically no paint is absolutely permanent forever as UV, moisture, and abrasion will eventually wear it.

What paint never comes off refers to most permanent durable paints that are very hard to remove once cured. No paint is truly permanent and impossible to remove, but some paints are extremely durable and resistant to removal. Epoxy paint, such as two part epoxy for floors and garages, cures very hard and chemical resistant and is extremely difficult to remove without grinding. Urethane and polyurethane paints are also very durable and hard to remove. Powder coating is baked on and very durable, hard to remove without blasting. Oil based alkyd enamel on trim is very durable and hard to remove. Automotive urethane clear coat is very hard. However, all paints can be removed with proper methods like sanding, chemical strippers, or media blasting, but epoxy and powder coat are closest to never comes off under normal conditions. For practical purposes, high quality exterior acrylic or elastomeric paint lasts many years but eventually fades and peels. So paint that never comes off is typically two part epoxy, powder coating, or catalyzed urethane, which are industrial strength and require grinding or blasting to remove, but no paint is truly permanent forever as all degrade with time, UV, and wear.