When it rains my door leaks rain water onto my drivers side seat leaviong it soaked. I inspected the moulding around the door and discovered a tear in the upper rubber moulding which I repaired with tape, but this did not fix the problem.

I own a 1999 chevy blazer.

You need new molding.

Try G.E. Silastic (RTV). Depending upon the situation, it may work.