Glass Scratch Removal Troubleshooting Guide

What you’re seeing

A milky or dull area that becomes noticeable in certain lighting conditions.

Why it happens

• The polishing stage has not been completed long enough

• Excess compound or water has reduced friction

• Insufficient pressure was applied to generate light heat

How to fix it

Continue polishing using firm, even pressure with the pad kept flat against the glass.

Work in small sections (approximately half an A4 sheet at a time) using slow, overlapping passes to maintain consistent friction and heat.

The glass should feel warm or slightly hot to the touch, but not uncomfortably hot

Use only a small amount of compound, adding a few drops at a time if needed.

You should feel steady resistance — this indicates the correct level of friction for the polishing compound to work effectively.

Expected result

A clear, optically transparent finish with no milkiness.

➡️ If the haze does not improve

If the area continues to show light sanding patterns or fine marks, the surface likely requires further refinement.

Please continue to:

Light sanding marks visible after polishing for the next corrective step.

What you’re seeing

Light, fine marks or faint sanding patterns visible in the repaired area.

Why it happens

• Marks from the Green abrasive stage were not fully removed

• The surface was not refined long enough with the Blue abrasive before polishing

How to fix it

1️⃣ Repeat the Blue abrasive stage

Repeat the Blue abrasive stage using even, consistent pressure with the pad kept flat against the glass.

Work using slow, overlapping passes, ensuring you fully cover the previously sanded area.

Continue sanding until all Green abrasive marks are completely removed and the surface becomes more transparent and evenly refined.

2️⃣ Proceed to polishing

Polish using firm, even pressure with the pad kept flat against the glass.

Work in small sections (approximately half an A4 sheet at a time) using slow, overlapping passes to maintain consistent friction and heat.

The glass should feel warm or slightly hot to the touch, but not uncomfortably hot.

Use only a small amount of compound, adding a few drops at a time if needed.

You should feel steady resistance — this indicates the correct level of friction for the polishing compound to work effectively.

Expected result

A clear finish with no visible sanding patterns.

📘 Need a visual reference?

For detailed technique and visual examples, see the full 👉step-by-step instructions:

Refer to Blue Abrasive Process (Steps 6–7).

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➡️ If marks remain visible

If sanding marks are still visible and do not improve with polishing, the surface likely requires further refinement from an earlier stage.

Please continue to:

Sanding marks that won’t polish out for the next corrective step.

What you’re seeing

Visible sanding marks, darker patches, or scratch patterns that remain even after extended polishing.

Why it happens

• The Green abrasive stage was not completed fully, leaving uneven areas

• The surface was not refined to a uniform frosted appearance before moving to the Blue stage

• Remaining Green abrasive marks cannot be removed by polishing alone

How to fix it

1️⃣ Return to the Green abrasive stage

• Use light, even pressure

• Sand until the entire repair area has a uniform, consistent frosted appearance

• Use gentle circular motions on darker patches and edges to blend

2️⃣ Repeat the Blue abrasive stage

• Overlap the previously sanded area

• Continue until all Green abrasive marks are fully removed and the surface becomes more transparent

3️⃣ Proceed to polishing

• Apply firm, controlled pressure

• Work in small sections (about half an A4 sheet at a time)

• Maintain light heat and steady resistance

Expected result

The repair area will appear evenly refined and will polish to full optical clarity with no visible sanding patterns.

📘 Need a visual reference?

For technique guidance and visual examples, see the full step-by-step instructions:

👉 View Instructions

Refer specifically to:

• Green Abrasive Process (Steps 1–5) — achieving a uniform frosted surface

• Blue Abrasive Process (Steps 6–7) — refining before polishing

If your repair area does not match the “even frosted appearance” shown, repeat the Green stage before continuing.

What you’re seeing

A wavy or uneven reflection in the repaired area, sometimes noticeable when viewing the glass at an angle or when light reflects across the surface.

Why it happens

• The repair area was sanded unevenly because the abrasive pad was not kept perfectly flat against the glass

• One spot was overworked or passes were not overlapped consistently, resulting in an uneven surface

• The edges of the repair area were not gradually expanded and blended into the surrounding glass, creating a slight dip where the tool repeatedly stopped

How to fix it

1️⃣ Return to the Green abrasive stage (blending step)

Fit a new Green abrasive and use very light, even pressure.

The goal is not to remove more glass, but to gently smooth and blend the worked area into the surrounding surface.

Work over a slightly larger area than before using slow, overlapping passes to keep the surface even.

Avoid focusing on one spot and keep the tool moving at all times.

2️⃣ Refine with the Blue abrasive

Repeat the Blue abrasive stage using light, even pressure to refine the surface after blending.

Continue until the area appears evenly refined and consistent with the surrounding glass.

3️⃣ Proceed to polishing

Continue polishing using firm, even pressure with the pad kept flat against the glass.

Work in small sections (approximately half an A4 sheet at a time) using slow, overlapping passes to maintain consistent friction and heat.

The glass should feel warm or slightly hot to the touch, but not uncomfortably hot.

Use only a small amount of compound, adding a few drops at a time if needed.

You should feel steady resistance — this indicates the correct level of friction for the polishing compound to work effectively.

Expected result

A smooth, uniform reflection across the repaired area that blends naturally with the surrounding glass.

📘 Need a visual reference?

For technique guidance and visual examples, see the step-by-step instructions:

👉 View Instructions

Refer to:

• Green Abrasive Process (Steps 1–5) — blending and surface levelling

• Blue Abrasive Process (Steps 6–7) — refining before polishing

What you’re seeing

Some scratches remain visible, appear sharp, or can still be felt with a fingernail after sanding and polishing.

Why it happens

• Some scratches are deeper than initially expected and require more time in the initial sanding stage

• The Green abrasive stage was not continued long enough to fully level the scratch

• Pressure or consistency during sanding was insufficient to effectively remove material

• The scratches were not identified during the Green or Blue abrasive stages, preventing earlier removal

How to fix it

1️⃣ Return to the Green abrasive stage

Use even, controlled pressure with the pad kept flat against the glass.

Work over an area slightly larger than the scratch using slow, overlapping passes.

Continue sanding until the scratch is no longer visible and the surface shows a uniform frosted appearance.

Clean the glass and inspect under sunlight or bright light to confirm the scratch has been removed.

2️⃣ Refine with the Blue abrasive

Repeat the Blue abrasive stage to remove Green abrasive marks and refine the surface.

Continue until the area becomes more transparent and evenly refined.

Clean the glass and inspect under sunlight or bright light to confirm the scratch has been removed.

3️⃣ Proceed to polishing

Continue polishing using firm, even pressure with the pad kept flat against the glass.

Work in small sections (approximately half an A4 sheet at a time) using slow, overlapping passes to maintain consistent friction and heat.

The glass should feel warm or slightly hot to the touch, but not uncomfortably hot.

Use only a small amount of compound, adding a few drops at a time if needed.

You should feel steady resistance — this indicates the correct level of friction for the polishing compound to work effectively.

Expected result

The scratches should no longer be visible, and the repaired area should have full optical clarity.

📘 Need a visual reference?

For technique guidance and visual examples, see the step-by-step instructions:

👉 View Instructions

Refer to:

• Green Abrasive Process (Steps 1–5) — scratch removal

• Blue Abrasive Process (Steps 6–7) — surface refinement

What you’re experiencing

The repair process is progressing slowly, or it feels like it is taking a long time to remove the scratch or refine the surface.

Why it happens

• Some scratches are deeper and naturally require more time to level

• Glass is a hard material, so removal happens gradually rather than quickly

• Light pressure, low tool speed, or low torque tools can slow progress

• A professional may spend 15–30 minutes repairing an area around the size of an A4 sheet, so DIY or first-time users can expect it to take longer

How to improve progress

1️⃣ Check your pressure and speed

Apply firm, controlled pressure during sanding while keeping the pad flat against the glass.

Ensure your tool maintains consistent speed and does not slow excessively under load.

2️⃣ Regularly tap the abrasive

Stop and tap the abrasive after every few passes to remove glass build-up.

This helps maintain cutting efficiency and speeds up material removal.

3️⃣ Work the correct area size

Work slightly beyond the scratch or repair area using slow, overlapping passes.

This helps remove material evenly and speeds up blending.

4️⃣ Inspect progress regularly

Clean the glass periodically and inspect under good lighting.

This confirms progress and prevents unnecessary extra work.

5️⃣ Continue the process patiently

Glass removal is gradual, and consistent technique will always produce better results than rushing.

Expected result

With consistent technique and experience, repair time will gradually improve and results will become easier to achieve.