SEM 39133 Flexible Primer Surfacer, Gray, 16 oz Aerosol
- SEM 39133 Flexible Primer Surfacer is a gray, sandable, flexible primer surfacer formulated to adhere to difficult plastics and fill minor surface imperfections. It delivers superior film build and flexibility when refinishing bumper covers and other plastic components.
- Features:
- Ready-to-spray aerosol format for quick application.
- Flexible formulation maintains adhesion and resists cracking or shrinking on plastic substrates.
- Easy to sand; smooth surface achieved with 320-400 grit after drying.
- Quick flash time between coats to expedite refinishing jobs.
- High solids formulation delivers good build per coat while remaining workable.
- Specifications:
- Manufacturer: SEM Products
- Part Number: 39133
- Color / Finish: Gray primer surfacer
- Container Type: 16 oz aerosol can
- Suitable Substrates: Plastics and urethanes commonly used in vehicle exterior trim and bumper covers
- # of Coats: Two medium coats
- Flash Time Between Coats: 5-10 minutes
- Drying Time Before Sanding: 30-40 minutes for final coat
- Sanding Grit: Block sand with 320-400 grit sandpaper
- VOC (Regulatory for Quart / Gallon Versions): ~601 g/L; aerosol “actual VOC” lower (see technical data)
- Mixing / Preparation: Shake aerosol can at least one minute after mixing ball begins to rattle; ensure surface is clean, scuffed, and prepped with appropriate cleaner
- Quantity: One aerosol can
- The SEM Flexible Primer Surfacer could also be called SEM 39133 Primer, Flexible Plastic Primer, Plastic Surfacer Gray, Quick Dry Plastic Primer Aerosol, and SEM Gray Flexible Primer Surfacer.
SEM Products develops the 39133 Flexible Primer Surfacer to provide a reliable base coat for plastic and urethane vehicle parts. It fills minor defects, adheres well to challenging substrates, and prepares surfaces for top coats with enhanced durability.
Q: Can this primer be applied directly on plastic bumpers without bonding issues?
A: Yes. When the plastic substrate is properly cleaned, scuffed, and prepared, this primer surfacer is formulated to adhere well without requiring harsh sanding.
Q: How long until I can sand and topcoat?
A: After applying two medium coats and allowing the final coat to dry for about 30-40 minutes, you can block sand with 320-400 grit. Topcoating can proceed once sanding is completed and surface is clean.
Q: What safety or storage concerns should I keep in mind?
A: Store the aerosol in a cool, dry place away from heat or flames. Use in well-ventilated area with appropriate PPE. Shelf life for aerosol version is two years under normal storage conditions.
