Bathtub refinishing calculator
Refinishing a bathtub uses epoxy or polyurethane coatings sold in 1-quart kits. A standard 60-inch tub has ~24 sq ft of paintable surface and one kit covers it with two coats. Larger soaking tubs and tile surrounds need more.
Honest take: refinishing vs. replacing
DIY refinishing kits run $50–100 and last 3–5 years before showing wear. Pro refinishing ($400–600) lasts 5–10 years. New tub ($600 plus $400–800 install) lasts 20+ years. Math depends on how long you'll be in the home — refinishing is the right choice for renters, flippers, and short-term holds; replacement is better for forever homes.
Prep is 80% of the result
DIY refinishing failures are almost always prep failures. You must: clean with abrasive cleanser, etch with the kit\'s acid (or sand thoroughly), tack-cloth, and apply when humidity is below 60%. Skip any of these and the new finish peels in months.
Ventilate and respect the cure
Epoxy refinishers off-gas heavily during application. Open windows, run a fan, wear a respirator. Don\'t use the tub for 48+ hours after coating; wait 7 days before scrubbing or running a hot shower.