Place of Origin:
Guangdong Province, China
Brand Name:
Gate Goldsun
Certification:
MSDS, TDS
Model Number:
Goldsun
GOLDSUN Waterproof Sandpaper is a silicon carbide abrasive sheet designed for manual wet sanding and dry sanding in automotive refinishing, body repair, surface preparation, woodworking, hardware finishing, and general industrial hand sanding.
The 230 × 280 mm sheet format provides sufficient working area for full-sheet sanding, folding, cutting, or use with a hand sanding block. The available 60#–2000# grit range supports different stages from coarse material removal and body filler shaping to fine primer sanding and clearcoat polishing preparation.
Its main process value is not simply removing material, but helping control scratch depth, surface flatness, residual sanding marks, dust or sanding slurry, and the surface condition before the next coating or polishing step.
Waterproof sandpaper is an abrasive paper designed to maintain practical sanding performance when used with water or other appropriate wet-sanding processes.
GOLDSUN silicon carbide sandpaper supports:
Wet sanding can help reduce abrasive clogging and carry away sanding residue, while dry sanding provides a convenient process for areas where water should not be introduced.
The appropriate method should always follow the coating manufacturer's process recommendations.
Silicon carbide is commonly used in applications requiring controlled and relatively fine surface refinement.
For automotive refinishing, the key objective is to create a controlled surface rather than simply remove as much material as possible.
GOLDSUN sandpaper can be selected according to the required sanding stage:
A finer grit generally produces shallower sanding scratches, but the correct grit should be determined by the existing surface condition and the requirements of the following coating system.
| Sanding Stage | Common Grits | Main Purpose |
|---|---|---|
| Body filler rough shaping | 60# / 80# / 150# | Rapid material removal and initial shaping |
| Body filler leveling | 150# / 240# | Further leveling and scratch refinement |
| Body filler finishing | 240# / 320# | Smoother transition before primer |
| Surfacer / primer sanding | 320# / 400# / 600# | Surface leveling and coating preparation |
| Fine pre-paint preparation | 600# / 800# | Reduce sanding marks before color application |
| Local fine sanding | 800# / 1000# | Fine repair and transition areas |
| Clearcoat refinement | 1000# / 1500# / 2000# | Fine defect removal and polishing preparation |
Note: These are common application directions rather than mandatory industry standards. Actual grit selection should follow the coating system, substrate condition, repair method, and technical data sheet.
60# and 80# are suitable for initial aggressive sanding where substantial material needs to be removed.
Typical applications include:
Because coarse abrasives create deeper scratches, the surface normally needs to progress through finer grits before primer or paint application.
Typical sequence: 60#/80# → 150# → 240# → 320#
Medium grits provide a transition from aggressive material removal to controlled surface refinement.
Commonly used for:
Useful for:
Suitable for:
The operator should avoid jumping directly from a very coarse grit to a very fine grit because deeper scratches may remain underneath the apparently smooth surface.
After primer or surfacer application, 400#–600# grits are commonly used for surface leveling and refinement.
400# can be used for general primer/surfacer sanding.
600# provides finer surface preparation before painting.
800# can be useful for fine transition areas and surfaces where residual scratches may become visible through metallic or pearl-effect coatings.
The final grit should be compatible with the coating manufacturer's recommended preparation process.
Fine grits are used when the objective shifts from material removal to surface refinement.
Suitable for:
Common applications include:
Used for:
Fine sanding should be performed with controlled pressure to avoid unnecessarily reducing coating thickness.
GOLDSUN sandpaper can be used in both wet and dry processes.
| Method | Typical Advantage | Typical Application |
|---|---|---|
| Dry sanding | Simple setup and no drying stage | Body filler, primer, general surface preparation |
| Wet sanding | Helps carry away sanding residue and may reduce clogging/dust | Fine sanding, selected primer/clearcoat finishing |
| Wet sanding with fine grit | More controlled fine surface refinement | Clearcoat and polishing preparation |
Wet sanding is not automatically better for every operation. Water should only be introduced where the substrate and coating system permit it.
After wet sanding, the surface must be thoroughly cleaned and dried before the next coating operation.
The standard 230 × 280 mm sheet provides flexibility for manual sanding.
The sheet can be:
Manual sanding remains useful even when a workshop also uses pneumatic or electric sanding equipment.
It is particularly practical for:
GOLDSUN waterproof sandpaper can be used throughout multiple stages of automotive body repair.
Used for shaping, leveling, and refining polyester body filler.
Used to level primer/surfacer and prepare the surface for subsequent coating.
Useful for controlled sanding of existing paint surfaces before repainting, subject to the condition and compatibility of the old coating.
Fine grits can be used for localized repair zones, edges, and transition areas.
Fine 1000#–2000# grits can be selected for suitable clearcoat refinement and polishing preparation.
A practical sanding workflow can follow the sequence below:
Step 1 — Inspect the Surface Identify filler, primer, old paint, scratches, defects, and areas requiring leveling.
Step 2 — Select the Starting Grit Choose the coarsest grit necessary for the required material removal.
Step 3 — Sand Evenly Maintain controlled pressure and avoid concentrating sanding on one small area.
Step 4 — Progress Through Grits Move progressively from coarse to finer abrasives instead of making a large grit jump.
Step 5 — Clean the Surface Remove sanding dust or slurry before inspecting the surface.
Step 6 — Inspect Under Suitable Lighting Check remaining scratches, low spots, sanding marks, and surface transitions.
Step 7 — Continue With the Appropriate Finer Grit Refine the surface until it meets the preparation requirements of the next coating.
Step 8 — Clean and Dry Before Painting After wet sanding, make sure the substrate is completely clean and dry before applying the next coating.
For wet sanding:
Avoid excessive water, uncontrolled pressure, or using an unsuitable wet process on moisture-sensitive substrates.
A fine grit may remove material too slowly and increase working time.
Very deep scratches from the coarse grit may remain underneath the finer sanding marks.
High pressure can create uneven sanding and localized low spots.
Excessive water can make process control difficult and may be unsuitable for certain substrates or coating systems.
An overly fine surface may not provide the mechanical profile required by a particular coating system.
Poor surface preparation, remaining scratches, contamination, incorrect grit selection, or inadequate cleaning can also affect the final appearance.
Although automotive body repair is a major application, GOLDSUN waterproof sandpaper can also support:
For non-automotive applications, users should confirm compatibility with the specific substrate and coating system before large-scale use.
| Item | Specification |
|---|---|
| Brand | GOLDSUN |
| Product Type | Silicon Carbide Waterproof Wet & Dry Sandpaper |
| Abrasive | Silicon Carbide |
| Sanding Method | Wet Sanding / Dry Sanding |
| Sheet Size | 230 × 280 mm |
| Available Grits | 60# / 80# / 150# / 240# / 320# / 400# / 600# / 800# / 1000# / 1500# / 2000# |
| Inner Packing | 100 sheets/book |
| Carton Packing | 10 books/carton |
| Quantity | 1000 sheets/carton |
| Main Application | Automotive Refinishing and Surface Preparation |
| Other Applications | Hardware, Woodworking, Industrial Hand Sanding |
| HS Code | 6805100000 |
| Grit | Carton Size | Net Weight | Gross Weight |
|---|---|---|---|
| 60# / 80# | 475 × 295 × 435 mm | 35.9 kg | 36.6 kg |
| 150# | 475 × 295 × 270 mm | 22.6 kg | 24.1 kg |
| 240# | 475 × 295 × 200 mm | 17.6 kg | 19.1 kg |
| 320# | 475 × 295 × 175 mm | 15.3 kg | 16.8 kg |
| 400# | 475 × 295 × 155 mm | 13.4 kg | 13.9 kg |
| 600# | 475 × 295 × 130 mm | 12.7 kg | 14.2 kg |
| 800# | 476 × 295 × 125 mm | 12.1 kg | 13.6 kg |
| 1000# | 475 × 295 × 120 mm | 11.7 kg | 13.3 kg |
| 1500# | 475 × 295 × 110 mm | 11.1 kg | 12.6 kg |
| 2000# | 475 × 295 × 105 mm | 10.4 kg | 11.9 kg |
Actual shipment dimensions and weights may vary by production batch.
GOLDSUN waterproof sandpaper is suitable for:
For distributors, the 60#–2000# complete grit range can support different repair stages instead of limiting the product to a single sanding application.
It is designed for wet and dry hand sanding. Typical applications include automotive body filler repair, primer/surfacer sanding, old paint preparation, fine finishing, and selected clearcoat sanding and polishing preparation.
60#, 80#, 150#, 240#, and 320# can be used at different stages. Coarser grits are generally used for shaping, while finer grits are used for leveling and final refinement.
400#–600# are common choices for primer or surfacer sanding, while 320# may be used for earlier-stage refinement depending on the coating system.
Yes. The product is designed for wet and dry sanding processes. The actual wet-sanding method should be compatible with the substrate and coating system.
Yes. These fine grits can be used for suitable clearcoat refinement and polishing preparation. The clearcoat must have sufficient cured film thickness and be suitable for sanding.
The standard sheet size is 230 × 280 mm. It can be used as a full sheet, folded, cut into smaller pieces, or used with a hand sanding block.
Not necessarily. The correct grit depends on the repair stage and coating system. Using a grit that is too fine too early can increase sanding time and may not provide the surface profile required for the next coating.
GOLDSUN offers 60#, 80#, 150#, 240#, 320#, 400#, 600#, 800#, 1000#, 1500#, and 2000#, covering coarse material removal through fine finishing and polishing preparation.
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