I BELIEVE YOU MUST HAVE WATCH THOSe VIDEOS WELL.
IT WORKS PERFECTLY FOR ALL KINDS OF MATERIALS .
20 YEARS SOLUTION.

Leakage on Fuel tanks, water tanks, pipe Leaks , roof ,bathroom, zinc, concrete, tiles and closet

VERY HIGH TEMPERATURE RESISTANCE. PERFECT FOR THE AFRICA KIND OF WEATHER CONDITION.
NO MELTING , NO REMOVAL. WATERPROOF.