09378 - 1 3M Perfect-It III 150mm honeycomb black polishing pad for a high-gloss finish

Technical specifications of the black 3M Perfect-It III 09378 Ø150 mm polishing foam

The black cell-structured 3M Perfect-It III 09378 Ø150 mm polishing foam is a professional pad specially designed for high-gloss finishing work on automotive paint and clears. Its fine cell-structured foam helps reduce swirl marks, fine scratches, and residual marks after polishing.

Part of the 3M Perfect-It III polishing system, it is used in particular with the 3M Perfect-It III 09376 machine polishing compound to enhance gloss and reflection clarity. Its 150 mm diameter makes it easy to work on body panels and painted surfaces. It is a particularly suitable accessory for body shops and automotive preparation professionals.

• Brand: 3M
• Reference: 09378
• Range: Perfect-It III
• Description: High-gloss polishing foam
• Type: Foam finishing pad
• Color: Black
• Diameter: 150 mm
• Material: Synthetic foam
• Structure: Cell-structured, waffle type
• Shape: Round
• Grade: Fine
• Number of working faces: 1
• Maximum permissible speed: 4,500 rpm
• Application: Machine polishing
• Machine: Polisher fitted with a compatible backing plate
• Recommended compound: 3M Perfect-It III 09376
• Substrates: Automotive paint and clears suitable for polishing
• Desired result: High-gloss finish and reduced swirl marks
• Use: Professional – Automotive bodywork and detailing

Benefits of the 3M Perfect-It III 09378 foam pad

• High-gloss finish: enhances the shine and depth of automotive paint.
• Reduces swirl marks: helps remove fine traces left by polishing operations.
• Cellular foam: helps distribute polishing compound and work evenly across the surface.
• Fine grade: suitable for final polishing stages.
• 150 mm diameter: ideal for working on different body panels.
• Uniform finish: helps achieve clear, sharp reflections.
• Compatible with the Perfect-It III system: pairs with suitable 3M finishing compounds.
• Professional use: suitable for automotive preparation and cosmetic refinishing.

Recommended applications

• High-gloss finish after abrasive polishing.
• Reducing residual swirl marks.
• Reducing fine polishing scratches.
• Polishing automotive paint and clears.
• Enhancing the depth and gloss of dark colors.
• Finishing body panels after paint repair.
• Cosmetic refinishing of automotive paint.
• Preparing vehicles before delivery.
• Finishing used vehicles before resale.
• Professional automotive detailing.

Application and usage tips

1. Preparing the bodywork

• Thoroughly clean the surface to be treated.
• Remove dust, contaminants and abrasive residue.
• Check that the clears have cured sufficiently.
• Carry out any necessary correction work beforehand.
• Wipe away compound residue with a clean microfiber cloth.
• Check the surface condition before polishing.
• Work on a clean, dry surface at a suitable temperature.

2. Installing the polishing foam pad

The 3M 09378 foam pad must be mounted on a polishing backing plate compatible with its dimensions and attachment system.

• Turn off and unplug the polisher before installation.
• Check the condition of the foam and backing plate.
• Position the pad correctly on its backing plate.
• Check that the foam is centered.
• SMake sure the fastening system is secure.
• Observe the speed limits for the pad, backing plate and machine.
• Perform a test at low speed before starting.

3. Application with 3M 09376 polishing liquid

For an optimal finish, use the foam with 3M Perfect-It III machine polishing liquid 09376. 3M recommends this combination for removing polishing marks and improving paint gloss.

• Shake the bottle of polishing liquid before use.
• Apply a moderate amount of product to the foam or painted surface.
• Spread the liquid before starting the polisher to limit splatter.
• For liquid 09376, use a working speed of 1,500 to 2,500 rpm, in accordance with its technical data sheet, with a suitable machine.
• Make steady, overlapping passes.
• Maintain low to moderate pressure.
• Gradually reduce pressure as the product begins to dry.
• Avoid prolonged pressure on edges and contours.
• Wipe away residue with a clean microfiber cloth.
• Check the gloss and any residual marks.

4. Finishing dark paints

Dark paints make fine scratches and swirl marks particularly visible. The 3M Perfect-It III black foam pad 09378 provides a fine finish after the correction steps.

• Use perfectly clean foam.
• Choose a compatible finishing liquid.
• Apply a moderate amount of product.
• Work with steady movements.
• Avoid applying excessive pressure.
• Wipe with a soft microfiber cloth.
• Check the result under suitable lighting.
• Repeat polishing locally if necessary.

5. Final gloss check

• Carefully remove any liquid residue.
• Inspect the surface from different angles.
• Check for any polishing haze.
• Check for any residual swirl marks.
• Assess the clarity and depth of the reflections.
• Perform an additional finishing step if necessary.
• Use a clean microfiber cloth for the final wipe.

Maintaining polishing foam

• Clean the foam regularly during use.
• Remove accumulated polish residue.
• Avoid mixing different polishing liquids on the same pad.
• Do not use heavily soiled foam.
• Clean according to the manufacturer's recommendations.
• Allow to dry completely before storing.
• Store in a clean, dry environment.
• Check for tears or deformation.
• Replace the foam when it shows signs of wear.

Precautions for use

• Use only with a compatible backing plate and polisher.
• Do not exceed the pad’s maximum speed of 4,500 rpm.
• Also follow the recommended operating speeds for the polishing compound being used.
• Do not use a damaged foam pad.
• Do not apply to a clears that has not cured sufficiently.
• Avoid working on a hot body panel.
• Keep the polisher moving.
• Monitor the surface temperature.
• Do not apply excessive pressure.
• Wear appropriate protective equipment.
• Follow the safety instructions for the machine and polishing products.

Complementary 3M products

• 3M 09376 – Perfect-It III 1 L machine polishing compound: finishing compound recommended with the 09378 black foam pad for a high-gloss finish.
• 3M 09375 – Perfect-It III 1 L fine polishing compound: fine-correction product for use in the steps before polishing.
• 3M 09374 – Fast Cut Perfect-It III 1 L abrasive polishing compound: compound designed for more substantial correction work.
• 3M 50488 – Perfect-It Ø150 mm yellow polishing foam pad: pad for intermediate polishing steps.
• 3M 50880 – Perfect-It Ø150 mm ultrafine blue foam pad: foam pad designed for very fine finishing.

Why choose the 3M Perfect-It III 09378 polishing foam pad?

The 3M Perfect-It III 09378 black convoluted polishing foam pad, Ø150 mm is a professional solution for achieving a high-gloss finish on automotive paints and clears. Its fine convoluted foam structure makes polishing easier and helps reduce fine scratches and residual swirl marks after polishing.

Combined with 3M Perfect-It III 09376 polishing compound, it helps improve gloss depth and reflection clarity. Its 150 mm diameter is suitable for working on various body panels. It therefore meets the needs of bodywork specialists, automotive refinishing professionals and detailing professionals seeking a neat, consistent finish.

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