Latex paint doesn't typically require an additional sealer. However, applying a clear topcoat over a latex-painted surface helps to seal and protect the surface area. Painted furniture that's subject to spills and wear-and-tear, such as tabletops and desks may benefit from a protective sealant. Clear sealants also provide additional protection for faux-painted walls. Topcoat sealants typically help in resisting damage from chipping, abrasion, scuffing, alcohol, water and a myriad of other household chemicals.

Hand holding paintbrush
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Use a quality paintbrush for applying a protective topcoat sealant.

Step 1

Remove outlet and switch plate covers with a screwdriver if applying topcoat sealant to walls. Tape screws to corresponding covers for ease in attaching them after painting. Also, remove all wall hangings and pictures.

Step 2

Apply painter's tape along adjoining surface areas that you don't want to paint.

Step 3

Lay plastic drop cloths over nearby floors, furniture or other surfaces to protect them from sealant splatters or spills.

Step 4

Sand the latex-painted surfaces lightly with fine-grit sandpaper. Wipe down sanded areas with a clean, damp cloth to remove sanding particles.

Step 5

Apply a thin coat of topcoat sealant to latex-painted surfaces with a paintbrush. Follow manufacturer's directions for drying time, which is typically a couple of hours.

Step 6

Sand sealed surfaces lightly with very fine-grit sandpaper. Wipe down sanded areas with a clean, damp cloth to remove sanding particles.

Step 7

Apply a second coat of topcoat sealant with a paintbrush. Follow manufacturer's directions for drying time, which is typically a couple of hours.

Step 8

Sand sealed surfaces lightly with very fine-grit sandpaper. Wipe down sanded areas with a clean, damp cloth to remove sanding particles.

Step 9

Apply a third coat of topcoat sealant with a paintbrush. Follow manufacturer's directions for drying time, which is typically 24 hours.

Step 10

Remove painter's tape and reattach outlet and switch plate covers.