[EJP914]

Just finished rebuild of left front caliper. Works great, but have some questions:
After bleeding caliper, bleeder valve seeps a little fluid. Reluctant to really tighten down on it. Can I wrap the threads with teflon tape or will the brake fluid disolve the tape?
I kept the brake pedal slightly depressed during rebuild of caliper, but after bleeding, I can't get the pedal to be as stiff as it was. I thought I got all the air out. Maybe I need to do agan? Do I need to bleed ALL of the calipers and not just the left front?
Do these "one man brake bleeding" trigger type bleeding devices really work?
Unrelated question, thinking about buying Brad Mayeur longitudinal reinforcement panels. What can I expect to pay to have these welded on? Ballpark number. Thanks in advance for all replies.