SEM 39133 Flexible Primer Surfacer Gray Sandable Plastic Primer Aerosol 13oz

SEM 39133 Flexible Primer Surfacer Gray

SEM 39133 Flexible Primer Surfacer is a professional‑grade gray aerosol primer designed to create a smooth, high‑build surface on automotive plastics and metals. This convenient 16 oz spray can eliminates the need for mixing or spray gun setup, making it ideal for both collision shops and serious DIY enthusiasts. Its flexible, high‑solids formula provides excellent adhesion, fills sanding scratches and minor surface imperfections, and sands easily to a fine finish.

Use SEM 39133 to prepare plastic bumpers, urethane parts, fiberglass, steel, and other properly prepared substrates before topcoating. The flexible primer surfacer helps prevent cracking or peeling on parts that flex, while its high build helps level out previous repair work or light texture. Once cured, it sands quickly without loading the paper, saving time and abrasives and delivering a uniform surface that’s ready for basecoat or single‑stage paint.

Application is straightforward: clean the part thoroughly, remove wax, silicone, and contaminants, and scuff the surface as recommended. Shake the can well and apply several light, even coats, allowing proper flash time between coats. After drying, block‑sand as needed to straighten the panel and then re‑coat or move directly to sealer and color. SEM 39133 is compatible with most modern automotive paint systems when used according to the technical data sheet, and it’s an excellent choice for bumper repairs, plastic refinishing, and general bodywork where durability and flexibility are critical.