Things You'll Need
Pressure washer
Rags
Oil-based primer
2- to 4-inch natural-bristled paintbrush
Mineral spirits
Latex paint
2- to 4-inch nylon paintbrush
Acrylic latex paint
Acrylic caulk is appropriate for painted surfaces, because it is well suited for adhesion. Unfortunately, inexperienced do-it-yourselfers often choose non-paintable caulk instead. Non-paintable caulk is made of clear silicone. If you apply paint directly over untreated silicone caulk, peeling will inevitably occur. Fortunately, you can paint non-paintable silicone caulk as long as you treat it with a special base primer. Employ the right preparation procedure, or you will have little chance at paint adhesion.
Step 1
Rinse exterior non-paintable caulk with a pressure washer. Use damp rags if the silicone caulk is located indoors. Allow at least two to four hours of dry time.
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Step 2
Purchase an oil-based primer that is compatible with latex topcoats. Coat the non-paintable caulk with the oil-based primer. Apply the primer, using a paintbrush that has natural bristles and is engineered for use with oil finishes. Wait two hours for the primed caulk to dry.
Step 3
Wash the brush with mineral spirits. Do not use tap water, as this will damage the brush.
Step 4
Coat the primed non-paintable caulk with latex paint, using a nylon paintbrush engineered for water-based finishes. Finish exterior non-paintable caulk with acrylic latex paint. Wait two hours for the finished caulk to dry.
Step 5
Wash the brush with water. Do not use mineral spirits, as this will damage the brush.
Tip
Kilz manufactures an oil-based primer that is compatible with latex topcoats.
Warning
Most oil primers will reject water-based latex paint. Examine the label to ensure that the oil primer you select will work with water-based topcoats.
Do not paint over unprimed non-paintable caulk, or adhesion problems will result.
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