Fusion SEP is for rigid surfaces that do not flex, like bare metal and hard plastic. Fusion FPP is for surfaces that bend and flex, like bumper covers, dashboards and flexible plastic trim. Both are medium grey, both apply between 55 and 82F, and both are rated to 250F, but Fusion FPP is ready to topcoat in 30 minutes and Fusion SEP in 1 hour.
Side by Side
| Fusion SEP | Fusion FPP | |
|---|---|---|
| Made for | Rigid surfaces that do not flex | Flexible surfaces that bend |
| Surfaces | Bare steel, aluminum, galvanized, copper, brass, bronze, chrome, fiberglass, polyester filler, most hard plastics, cured RustSeal | Flexible plastics, urethanes, wood, fiberglass, carbon fiber, metal |
| Sizes | Aerosol, 8oz, pint, quart, gallon, 5 gallon pail | Aerosol only |
| Surface prep | Clean and dry | Clean and dry, then sand lightly with fine sandpaper or steel wool for maximum adhesion |
| Dry to the touch | 15 minutes | 10 minutes |
| Ready to topcoat | 1 hour | 30 minutes |
| No sanding needed if topcoated within | 24 hours | 7 days |
| After 7 days | Scuff with 300 grit | Scuff with 300 grit |
| Aerosol coverage | Up to 35 sq. ft. | Up to 18 sq. ft. |
| Color | Medium grey | Medium grey |
| Heat rating | 250F | 250F |
When to Use Fusion FPP
Use Fusion FPP on bumper covers, dashboards, body panels and household plastics, and on urethane, wood, fiberglass, carbon fiber and metal. The Fusion FPP directions call for light sanding with fine sandpaper or steel wool for maximum adhesion on plastic, then thin covering coats: one is generally enough, or 2 to 3 light to medium coats with 3 to 5 minutes between them. It is dry to the touch in 10 minutes and ready for BlackTop, KBS MAXX, KBS Top Coater or KBS Top Coater Aerosol in 30 minutes. For a textured finish on plastic bumpers, KBS Bed Renu can go over Fusion FPP.
When to Use Fusion SEP
Use Fusion SEP on anything rigid: bare metal, hard plastic, factory paint and fully cured RustSeal. It comes in six sizes and can be brushed, rolled or sprayed as well as applied from an aerosol, so it suits larger jobs. It is also the step that makes sealing a plastic tank possible: polyethylene tanks need Fusion SEP first, worked around the inside of the dry tank for up to 15 minutes, before the Tank Sealer goes in. For a full walkthrough on plastic parts, see how to get paint to stick to plastic.
Frequently Asked Questions: Fusion SEP vs Fusion FPP
Still have questions about Fusion FPP or Fusion SEP? Contact us for help.
