The video demonstrates using Flex Seal aerosol (black) to restore a rusty back bumper, making it look brand new by coating, protecting, and stopping rust bleed.

Surface Preparation:

The most important step is proper surface prep. You don't need to remove every piece of rust - just the loose material. Use a scuff pad to take off surface rust and anything loose, then clean with denatured alcohol and a microfiber rag. Some rust can remain attached to the bumper as long as all the loose material is removed. A clean surface is essential for Flex Seal to do its job properly.

Application Technique:

1. Shake and test - Shake the can well, then do a test spray away from the surface to clear any solvent from the tube
2. First coat (light) - Use long sweeping strokes, staying in motion. Don't sit in one spot too long and keep the can at a distance (not too close). Apply a light base coat that allows some rust to peek through - this helps it grab onto the bumper and rust better
3. Touch test - After a couple minutes, touch the surface. When it's dry enough, apply additional light coats
4. Additional coats - Always be in motion before pulling the trigger to avoid blotchy spots. Continue building up light coats until full coverage is achieved

Pro Tips:

• Multiple light coats work better than one heavy coat
• Always start moving before pulling the trigger
• After finishing, turn the can upside down and spray until it runs clear to empty the nozzle and prevent clogging

Result: The bumper transformation is dramatic - going from rusty to looking brand new in just minutes, and it's rain-ready once dry.