Would it work on gluing back rubber pads on the nose bridge of plastic frame sunglasses?

Yes, This glue will be effective in gluing pads onto sunglasses frames. If they are metal, you'd be best off scuffing the metal with sandpaper to ensure adhesion; for plastic this won't be a problem.

do you need to use a primer?, can I use it fix my cracked kicking fin for swimming (silicone/rubber), need to be a strong bond

No. I used it on my tennis shoes. I just cleaned the area with alcohol.

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3M Scotch-Weld 25204 Plastic and Rubber Instant Adhesive PR40, 20 g Bottle, 0.676 fl. oz.

Product ID: 549750264

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Details

Brand
3M
Specific uses for product
Craft
Material
Rubber
Item form
Gel Liquid
Special features
Strong

⚡Fast curing under 30 seconds

🎯Pinch bottle for precise drops

🔗Strong bond on plastics & rubbers

Description

🔗 Stick with the best—instant strength, zero downtime!

COMPACT READY TO USE - 20g bottle designed for professional use—portable and efficient.
PRECISION IN EVERY DROP - Pinch or squeeze for exact adhesive control—no mess, no waste.
VERSATILE BONDING POWER - Reliable adhesion on tough substrates like EPDM, nylon, polypropylene, and polyethylene.
SPEED THAT KEEPS YOU MOVING - Fast curing formula accelerates project timelines effortlessly.
LOW VISCOSITY HIGH PERFORMANCE - Easily applied liquid that penetrates surfaces for a durable hold.

3M Scotch-Weld 25204 PR40 is a 20g instant adhesive engineered for fast, precise bonding of plastics and rubbers. Its low viscosity and pinch bottle design enable controlled application, while the quick-curing formula ensures durable, long-lasting bonds on challenging substrates like EPDM and polypropylene, making it ideal for professional-grade repairs and projects.

Specifications

Package Dimensions	10.9 x 3.91 x 2.21 cm; 20 g
Item model number	25204
Number of Puzzle Pieces	1
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Rubber
Color	Clear
Release date	3 June 2017
ASIN	B072Q9DBB5

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