Should you use fabric reinforcement tape with this? Like is recommended with FlashSeal?

Are you talking about the mesh material. First cut your pieces or have a pair of scissors I find her easier to use. Get a cheap paint brush take your time paint above flashing onto the brick above the flashing and lay the mesh over. You got about 10-20 seconds to play with it …after that she gets hard to work with, and you’ll make it look worse. If you need to do a second coat wait until it dries then go back and put a second coat. If you try to go back and add more before it’s dry you’ll just mess it up. This is the type of information it takes years to acquire through trial and error. if you don’t do it right, it’s a pain to remove and then you’re really getting into a sticky situation. So recap. Depending on the size of the chimney, and I would do med/ large sections at a time. I have your pieces ready put your first coat on lay you mesh pieces and make sure you put your second coat thick enough that you can’t see the mesh.

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🛡️ Seal the deal—keep your roof leak-proof and worry-free!

FLEXES WITHOUT FAIL - Remains pliable over time—no cracking, chipping, or brittleness.
DIY FRIENDLY APPLICATION - Simply brush on for fast, mess-free sealing—no special tools needed.
MULTI SURFACE PROTECTION - Ideal for chimneys, skylights, vents, and other roof penetrations.
BROAD COVERAGE BLACK FINISH - Covers 14 sq. ft. per half gallon with a sleek, professional black coat.
WATERPROOF ARMOR FOR YOUR CHIMNEY - Stops leaks where roof meets chimney with a durable, watertight barrier.

MasonryDefender Chimney Flashing Sealer is a flexible, waterproof coating designed to protect chimney flashings and other roof penetrations from water leaks. It applies easily with a paint brush, cures quickly, and remains flexible over time to prevent cracking. Available in black, one half-gallon covers 14 sq. ft., providing long-lasting, professional-grade protection for your roofline.

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