GOODING GD-30 2K Primer Surfacer GD-31 Hardener Automotive Sandable Filler

GOODING GD-30 is a multipurpose two-component primer surfacer designed for automotive repair and refinishing preparation. Used together with GD-31 Primer Hardener, it is intended for properly cleaned, hardened, and sanded old paint films, compatible primer layers, and fully cured body filler repair areas.

The product is designed to create a sandable intermediate layer before compatible color coat and clear coat application. With correct substrate preparation, mixing, spraying, curing, and sanding, GD-30 may help refine minor sanding marks, small pinholes, and surface transitions remaining after body repair work.

It is suitable for collision-repair shops, automotive paint distributors, vehicle refurbishment centers, and refinish-material wholesalers.

1. Multipurpose 2K Primer Surfacer

GD-30 is designed for use over hardened and sanded old paint, compatible primer layers, and fully cured body filler. It supports common automotive repair and repainting workflows.

2. Designed for Surface Refinement

Applied in controlled coats, the primer surfacer may help improve the uniformity of prepared repair areas before topcoating. It is intended to refine minor defects, rather than replace proper dent repair or body filler work.

3. Sandable Intermediate Coating Layer

After suitable curing, GD-30 is designed to be sanded before the next coating operation. Proper sanding helps establish a smoother base for compatible basecoat, direct gloss topcoat, or clear coat systems.

4. Defined Application Process

The system provides clear mixing, viscosity, spray-gun, film-build, flash-off, and curing guidance for workshop process control.

5. Temperature-Based Reducer Selection

• Below 25°C: G-1 Reducer
• 25°C and above: G-2 or G-3 Reducer

Actual reducer selection should be verified according to panel temperature, airflow, humidity, spray-booth conditions, gun setup, and the operator’s established process.

6. Practical Repair-Shop Curing Schedule

The stated sanding windows are approximately:

• 15°C: 3 hours
• 23°C: 2 hours
• 60°C baking: 30 minutes

Actual sanding readiness should be checked under real application conditions.

GOODING GD-30 is intended for properly prepared, dry, stable, and sanded surfaces, including:

• Hardened old paint films with sound adhesion
• Compatible primer layers
• Fully cured and sanded body filler / polyester putty areas
• Automotive collision-repair panels
• Used-car refurbishment and repainting projects
• Local repair areas requiring a sandable primer layer
• Full-panel or full-vehicle refinishing preparation
• Properly prepared plastic bumper repairs, where a suitable plastic primer and compatible coating process have been used

Unstable, peeling, poorly adhered, wet, waxed, oily, or contaminated coatings should be removed or corrected before application.

After filler application and sanding, small pinholes, fine sanding scratches, and shallow surface irregularities may remain. GD-30 can be applied as an intermediate primer surfacer layer before sanding and finishing.

For stable old paint that has been hardened and sanded, GD-30 may be used as part of a repair or repainting process before compatible topcoats are applied.

A well-prepared and evenly sanded primer surfacer layer may help support a more consistent appearance of the subsequent color and clear coat. Final gloss and appearance depend on the complete coating system and application process.

Vehicle doors, hoods, and bumper-related repair zones experience routine movement and vibration. Long-term coating performance depends on appropriate substrate treatment, film thickness, curing, flexibility of the complete coating system, and topcoat compatibility.

Mixing ratio by weight: 4 : 1 : 1.5–2

Mixing ratio by volume: 3 : 1 : 1.5–2

Use clean measuring equipment. Mix thoroughly until uniform before checking viscosity and spraying.

Ensure that the substrate is fully cured, dry, stable, and correctly sanded. Use a professional degreasing cleaner to remove wax, oil, grease, silicone, dust, and other contamination.

Mix GD-30, GD-31 Hardener, and the selected reducer according to the stated ratio. Do not estimate proportions by eye.

At 23°C, adjust the mixed material to 20–24 seconds using a Ford Cup No. 4.

Final gun settings may require adjustment according to the specific spray gun model and working environment.

Apply 2–3 coats with even overlap.

Avoid excessively wet coats or excessive film build in one application cycle.

Allow the applied primer to stand for 15–20 minutes before raising the temperature for baking.

Confirm adequate curing before sanding. Select sanding abrasives according to the next compatible coating system and repair procedure.

Compared with premium-priced international refinish brands, GOODING GD-30 is positioned as a practical 2K primer surfacer solution for buyers seeking balanced application efficiency and overall procurement value.

Compared with entry-level 1K primers or lower-grade solvent primer products, GD-30 is designed as a two-component system used with GD-31 Hardener. Proper preparation, mixing, and curing remain essential to coating adhesion, sanding performance, and final finish quality.

1. Is GOODING GD-30 a 1K or 2K primer?

GD-30 is a two-component primer surfacer and should be used with GD-31 Primer Hardener.

2. What surfaces can GD-30 be applied over?

It is intended for properly prepared hardened old paint, compatible primers, and fully cured, sanded body filler.

3. What is the correct mixing ratio?

By weight, use GD-30 : GD-31 : Reducer = 4 : 1 : 1.5–2. By volume, use 3 : 1 : 1.5–2.

4. Which reducer should be used below 25°C?

G-1 Reducer is recommended below 25°C. At 25°C and above, G-2 or G-3 Reducer is recommended.

5. What spray-gun setting is recommended?

Use an RP spray gun with a 1.6 mm fluid tip at 1.8–2.0 bar air pressure.

6. How many coats should be applied?

Apply 2–3 coats, with a recommended film thickness of 40–60 μm and 5–10 minutes flash-off between coats at 23°C.

7. Can GD-30 be baked immediately after spraying?

No. Allow the coated workpiece to stand for 15–20 minutes before baking.

8. How long should I wait before sanding?

The stated sanding time is approximately 3 hours at 15°C, 2 hours at 23°C, or 30 minutes after baking at 60°C. Always check actual curing before sanding.

9. Can GD-30 replace body filler?

No. GD-30 is a primer surfacer intended to refine correctly repaired and leveled surfaces. It is not intended to replace body filler for deep dents, major pinholes, or structural repair work.

10. Can it be used on plastic bumpers?

It may be used as part of a compatible plastic repair system after correct plastic preparation and use of a suitable adhesion-promoting primer where required.

Store in original sealed containers at 5–35°C. Keep away from direct sunlight, heat, ignition sources, moisture, and incompatible materials.

Shelf Life: 2 years under recommended original sealed storage conditions.

This product contains organic solvents. Use only in well-ventilated working areas and follow applicable local safety requirements.

• Wear suitable gloves, eye protection, and protective clothing.
• Use suitable respiratory protection during spray application where required.
• Keep away from sparks, flames, and heat sources.
• Avoid inhalation of spray mist and solvent vapor.
• Consult the applicable Safety Data Sheet before handling, storing, transporting, or disposing of the product.