How to Properly Prepare and Paint a Porcelain Bathtub
Giving your outdated porcelain bathtub a fresh makeover with paint can breathe new life into a bathroom. With the right preparations and painting technique, you can achieve professional-looking results. The first step is gathering the necessary supplies to properly prepare, prime and paint the porcelain tub surface.
You'll need a high-quality tub and tile refinishing kit made specifically for painting porcelain like those from Rust-Oleum or Behr. The kit should include an etching primer, tub and tile paint, applicator brushes and supplies for proper surface prep. You'll also need sandpaper , masking tape, plastic sheeting, tack cloths and disposable gloves.
Don't forget the prep work materials. Pick up a quality tub and tile cleaner to remove soap scum and mildew from the porcelain before priming. A caulking removal tool or sharp razor will help remove old caulk around the tub. Choose safety gear like a respirator mask and open windows to ensure proper ventilation during the painting process.
Key Supplies Checklist
- Tub and tile refinishing kit
- Tub cleaner
- Sandpaper
- Masking tape
- Plastic sheeting
- Tack cloths
- Disposable gloves
- Respirator mask
Prepare the Tub Surface
Preparing the surface is crucial for proper paint adhesion. Start by removing all caulk around the tub with a razor or caulking removal tool. Wipe away any soap scum, mildew and dirt with a tub and tile cleaner formulated to cut through grime. Be sure to follow the cleaner instructions carefully.
Once clean, lightly scuff the entire tub and tile surfaces surrounding the tub using 400 grit sandpaper. Always sand in the same direction - up and down or side to side. The sanding roughs up the smooth porcelain so the primer and paint have something to grip.
Finish prepping by carefully wiping away all sanding dust using tack cloths. The porcelain must be completely clean and dust-free before priming. Now you're ready to start applying the primer coat.
Surface Prep Steps
- Remove old caulk
- Clean tub and tiles thoroughly
- Sand surfaces with 400 grit sandpaper
- Wipe away all dust with tack cloth
Applying the Primer Coat
Etching primers are formulated especially for slick surfaces like porcelain. Always read the manufacturer's instructions since mixing ratios and drying times can vary between brands. Thorough mixing and following the proper application techniques are key for successful adhesion.
Most tub refinishing kits recommend using a paintbrush or small foam roller to apply the primer. Work in small sections using long, even brush strokes or roller passes to coat the surface. Avoid puddling or dripping by spreading the primer thin and evenly.
Allow the full drying time stated on the instructions before sanding or recoating. Drying usually takes a minimum of 12 hours. Once dry, lightly sand again with fine sandpaper. Then wipe away dust with a tack cloth before adding the second primer coat.
Primer Tips
- Read and follow the manufacturer's instructions
- Apply using a brush or small foam roller
- Allow proper drying time between coats
- Sand lightly before adding a second primer coat
Painting the Porcelain Bathtub
With the primer fully cured, you're ready to start painting.Mix the tub and tile paint thoroughly before pouring it into a paint tray. Plan to apply at least two coats of paint for complete coverage over the primer.
Use the same brushing techniques as you did for the primer. Apply the paint in small sections using even, overlapping strokes. Having adequate lighting and ventilation in the bathroom is key for seeing small missed spots and avoiding breathing paint fumes.
Let the first coat dry fully per the manufacturer's instructions before sanding lightly and wiping away any dust. The second coat of paint helps cover any thin or missed spots. Allow for the full curing times stated before planning to use the tub or expose the paint to water.
Painting Tips for Porcelain
- Stir paint thoroughly before and during application
- Apply at least two coats for coverage
- Allow proper drying time between coats
- Sand lightly before adding the final coat
Achieving a Smooth Factory-Like Finish
Achieving a smooth, flawless painted finish takes skill and patience. Avoid applying the paint or primer too thick. Thinner coats dry better than thick, globby coats.
Gently sanding between coats with fine 400-600 grit sandpaper helps level each coat. Any brush marks and imperfections are smoothed out for a porcelain-like finish. Be sure to properly clean brushes between coats too.
Wet sanding after the final coat with extremely fine sandpaper helps remove any remaining brush marks and imperfections. Use a random orbital sander for best results. Finish by buffing out the paint for a glossy, factory-smooth look.
Smoothing Tips
- Apply thin, even coats of paint and primer
- Sand lightly between coats
- Wet sand once fully cured
- Buff and polish for a porcelain sheen
Sealing and Protecting the Finish
The final step is applying a clear sealer for added protection and longevity. Use a sealer recommended for tub and tile refinishing projects. Water-based polyurethane and epoxy sealers work best.
Plan to apply 2-3 thin coats of sealer following the product instructions, allowing proper drying time between coats. The sealer prevents moisture from seeping under the tub paint and ruining the paint job. Help the sealer cure fully by avoiding baths or showers for several days.
Sealing Tips
- Use a recommended tub and tile sealer
- Apply 2-3 thin coats
- Allow sealer to cure fully before use
- Avoid water exposure for several days
Caring for the Finish Properly
Once cured and sealed, a painted porcelain bathtub can last for many years with proper care. Always use a non-abrasive bathroom tub and tile cleaner. Stay away from harsh cleansers, bristle brushes and scouring pads which can damage the painted finish over time.
Try to wipe spills and cleaning solutions right away before they have time to eat through the sealer. Periodically check for worn areas around the drain and bottom of the tub which see more wear. Touch up these spots with fresh paint to prevent moisture damage.
- Use non-abrasive cleaners
- Avoid abrasive pads and brushes
- Rinse cleaning solutions promptly
- Touch up worn areas as needed
A bathtub paint job can look like new porcelain without the high replacement cost. Just take your time following each step and use high-quality tub refinishing products for a long-lasting finish you'll love.