SEM Trim Black Aerosol Spray 15 oz (2-Pack) — Satin Black Trim Paint, Flexible No‑Primer Finish

SEM 39143 Trim Black Aerosol is a 15 oz satin black trim paint designed to restore and protect exterior automotive trim without primer.

This aerosol delivers a satin finish formulated to match many factory exterior trim components. It offers good coverage, flexibility to resist cracking on pliable parts, and can be applied without a separate primer when proper surface preparation is followed. The can is convenient for spot repairs, trim refreshes, or full component refinishing on bumpers, mirrors, moldings and other exterior trim pieces. Follow recommended cleaning, sanding and application steps for best adhesion and durability. Note: contains chemicals listed by California as reproductive or carcinogenic hazards; read label and use appropriate ventilation and protective equipment.

How should I prepare plastic or painted trim before spraying?

Proper surface prep ensures adhesion and a uniform appearance. Clean away dirt, grease and wax, sand lightly, and remove any residues before painting.

• Wash with SEM 39362 or equivalent automotive soap to remove grime.
• Degrease with a quality grease and wax remover such as SEM 38373.
• Sand the surface with 400-grit paper to promote mechanical adhesion.
• Re-clean with degreaser and mask surrounding areas to prevent overspray.

What application technique gives the best finish?

Light, even mist coats deliver a smooth satin look and minimize runs. Allow brief flash times and build the film gradually for optimal flexibility and coverage.

• Shake the can well before use and hold 6–8 inches from the surface.
• Apply several thin coats rather than one heavy coat; wait 5–10 minutes between coats.
• Multiple light passes reduce orange peel and sagging on vertical areas.
• Let the painted part cure; full hardness and maximum adhesion develop around 48 hours.

Will I need primer, and how durable is the finish?

In most trim applications primer is not required because the product is formulated for direct adhesion to many exterior trim substrates. The satin finish retains flexibility to resist cracking on flexible parts.

• No primer is generally necessary when the surface is properly prepped.
• Designed to match factory satin/gloss levels on many trim pieces.
• Retains flexibility to accommodate movement without flaking.
• Allow full cure time for improved hardness and long-term adhesion.

Who is this for: SEM 39143 is aimed at DIYers, body shops and restoration enthusiasts who need a ready-to-spray satin black trim paint for exterior automotive components. It suits owners refreshing faded or mismatched trim, technicians performing spot repairs, and restorers seeking a flexible, factory-matching finish in a convenient aerosol can. Always use appropriate safety gear, work in a ventilated space, and follow local regulations for solvent-based coatings.

• No primer required
• Retains flexibility
• Great coverage