Things You Will Need
If you want to paint a shower stall, sand it first to generate a coarser environment more appropriate for adhesion. Because shower stalls are consistently inundated with water, they aren't appropriate for ordinary paint. Choose a lasting epoxy finish, or expect serious paint failure.
Prepare the Stall
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Wash the stall with a powerful cleanser. Scrub away soap scum, using a coarse nylon pad. Be thorough, or adhesion difficulties will follow. Rinse the stall with wet rags. Let the stall dry for three or four hours.
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Scuff the stall with sandpaper to promote a rougher surface better suited for primer. Use 120-grit sandpaper on tile stalls. Use 220-grit sandpaper on vinyl/fiberglass stalls.
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Take the time to carefully cover the outer walls and flooring adjacent to the stall. Cover these areas, along with shower hardware, using painter's tape.
Finishing the Stall
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Pour 1 gallon of primer into your 5-gallon bucket.
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Apply primer to the stall, using a roller. Prime one stall wall at a time. Smooth that wall, using a polyester brush. Continue until the entire stall is primed. Let the stall dry for two hours.
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Wash your bucket and application tools with water.
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Mix the epoxy catalyst and resin in the bucket. Stir the components together for four minutes.
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Paint the stall as you primed it. Let the stall dry for three hours.