I want to fix some blemishes on a camera lens. What kind of applicator would be the best for something like this? Cloth, microfiber cloth, hand??

I would start with the 100000 grit which is the less aggressive compound of the 3 and I would hand polish it with a microfiber cloth. If your results aren't quit what you expected then go to the next grid which is 50000 and if that works then finish it off again with the 100000 to get a smooth blemish free surface. Side note, if your nail gets into the scratch, forget it and call it a day since nothing will fix that severe of damage.

For camera lens with deep scratches, would you recommend 4000, 8000 & 50000? Hand polish it or use dremel? Thanks

Don't use a dremel! I used a dremel to polish a knife blade and spent 4 days trying to fix the damage.

What would you recommend to polish hard plastic to a glass like finish?

They make a special polish for this. We used it to clean plexiglass in TN the AF.

Will the 4000 grit polishing compound give a finish comparable to a 4000 grit sandpaper? If not, what difference would I see with the compound?

Diamond compound generally gives much better result than sandpaper, mainly because diamond is the hardest abrasive ever (which generally is not used in sandpaper). But the finish really depends on the material, for harder materials the difference in the finish will be more noticeable than for softer ones.

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TechDiamondTools Kit of 3 Diamond Lapping Paste Polishing Compound USA Made 600 1050 1500 Grit Lapping Compound for Rock Glass Metal Jewelry Resin Marble with High Concentration of Diamond Powder

Product ID: 343608118

Details

Brand
Grit material
Diamond
Grit type
Fine
Item dimensions L x W x H
17.8 x 10.2 x
Material
Diamond

💎50% diamond powder concentration

🧴5g precision syringe for clean, controlled application

⚙️3-step progressive grit system (600, 1050, 1500)

Description

💎 Elevate Your Craft with Diamond Precision – Because First Impressions Shine Brightest

DIAMOND POWERHOUSE - 50% ultra-concentrated diamond powder delivers rapid stock removal and high-gloss shine.
PRECISION CONTROL IN YOUR HANDS - Oil-based formula in labeled syringes ensures mess-free, exact application with zero cross-contamination.
VERSATILE SURFACE COMPATIBILITY - Polish everything from metals and gemstones to glass, marble, and plastics with one kit.
MIRROR PERFECT FINISH EVERY TIME - Progressive 3-grit system removes scratches step-by-step for flawless polishing.
MADE IN THE USA TRUSTED WORLDWIDE - Crafted for professionals and serious hobbyists who demand premium quality and consistent results.

TechDiamondTools Kit includes three USA-made diamond lapping pastes in 600, 1050, and 1500 grit syringes, each with 50% diamond powder concentration. Designed for progressive polishing on metals, gemstones, glass, and more, this oil-based compound offers clean, controlled application and delivers a mirror-like finish favored by knife makers, jewelers, and watchmakers.

Specifications

ASIN	B06ZZ8V2K1
ASIN	B06ZZ8V2K1
Brand Name	TechDiamondTools
Compatible Material	Metal
Customer Reviews	3.7 3.7 out of 5 stars (10)
Customer reviews	3.7 3.7 out of 5 stars (10)
Date First Available	5 January 2018
Grit Material Type	Diamond
Grit Number	1500
Grit Type	Fine
Is Discontinued By Manufacturer	No
Item Dimensions	17.8 x 10.2 x 1.9 centimeters
Item Weight	1 Ounces
Item model number	H-600-1050-1500
Manufacturer	TechDiamondTools
Manufacturer	TechDiamondTools
Material Type	Diamond
Model	H-600-1050-1500
Number of Items	3
Number of Packs	1
Part Number	H-600-1050-1500
Product Dimensions	17.78 x 10.16 x 1.91 cm; 28.35 g
Set Name	TechDiamondTools Diamond Lapping Paste Kit (3 Piece)
UPC	818510014949
Unit Count	1.0 Count

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