Koch Chemie Motorplast is a professional engine bay dressing and protective coating that restores a clean, naturally shiny finish to engine components, housing parts, rubber hoses, plastic covers, and power units in cars and commercial vehicles. The high-temperature resistant formula withstands temperatures up to 250 degrees Celsius, making it genuinely safe for engine bay use where most dressings would degrade or burn off.

Dries to a permanently elastic protective film that is completely non-greasy and non-lubricating, so there is no risk of slippery surfaces or attracting excess dirt. The film shields components from corrosion, moisture, and environmental damage while leaving a clean, like-new appearance throughout the engine bay. Can be applied to wet or dry surfaces for flexibility during the detailing process. Pleasant fragrance that leaves the engine bay smelling fresh.

If you are looking for the best engine bay dressing for professional detailing, a high-temperature resistant engine protectant that leaves a clean non-greasy finish, or a Koch Chemie engine bay product that protects rubber, plastic, and metal components from corrosion and moisture long-term, Motorplast is the professional-grade solution for engine bay detailing. Available in 500ml and 5L.

Koch Chemie Motorplast Usage

Motorplast is Koch Chemie's engine bay sealant and underhood dressing — protects plastics, rubber, and metal from heat cycling, UV, and corrosion while restoring color to faded engine bay components.

• Prep: Clean engine bay with Green Star (1:5) or MZR. Rinse, dry thoroughly.
• Application: Spray onto cool engine bay components, wipe to even coverage.
• Avoid: Drive belts, contact surfaces. Motorplast is slippery on rubber belts.
• Durability: ~6 months underhood.

Frequently Asked Questions

Is Koch Chemie Motorplast safe on hot engines?

Apply only to COOL engines. Motorplast is solvent-based and can flash off or stain if sprayed on hot metal. After applying, you can run the engine — it's designed to handle heat cycling — just don't apply to a hot surface.

How long does Koch Chemie Motorplast last in an engine bay?

About 6 months. Heat cycling, detergent washing, and high-pressure rinsing will reduce that. For dealership recon cars, Motorplast keeps the bay looking fresh through delivery. For long-term garage queens, reapply every 6-12 months.

Do I need to rinse Motorplast after applying?

No rinsing — spray, wipe to even coverage, close the hood. The product cures as the engine warms up and becomes part of the protected surface.

Buying for a shop? See our Koch Chemie wholesale program for B2B pricing on this and the full Koch Chemie lineup.