Can this be use for sealing under/around solar panel mounting roof brackets?

not compatible with asphalt roof systems

So this will work with a standard caulk gun. Does it come with a screw on tip?

yes, a standard gun will work just fine. the caulking is stiff like most polyurethanes. Yes, it does have a screw top

can this be applied with a regular caulking gun?

Yes, pull the tamper seal from the back and there is a standard caulking gun plunger behind the seal

Is this color/shade of gray dark, say 75% to 80+% of black? Or, is it considerably lighter than that in color/percentage of black?

Much lighter than black and dries clear

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Deliver to Slovakia

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🔒 Seal the Deal with 3M's Ultimate Flexibility!

DESIGN FREEDOM - Bonds dissimilar materials, unlocking endless design possibilities.
SEAL WITH CONFIDENCE - Experience permanent elasticity for dynamic joint movement.
WEATHER THE ELEMENTS - Enjoy superior UV resistance for long-lasting durability.
SIMPLIFIED APPLICATION - One-component, moisture-curing formula for hassle-free use.
SPEED MEETS VERSATILITY - Achieve a skin time of 60-90 minutes—paintable once set!

The 3M Polyurethane Sealant 540 is a high-performance, moisture-curing sealant designed for multi-purpose bonding and long-lasting seals. With a skin time of 60-90 minutes and excellent UV resistance, it simplifies production while allowing for joint movement and bonding of dissimilar materials.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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