I ended up sanding mostly built up areas and spots that were flaking or
looked like it might be starting.

I don't know what paint is on there now but what I ended up using was a
drywall sanding screen. I must say it worked really well and hardly wore out
the pad at all. A lot of the dust would collect right in the pad and all I
had to do was tap it and it would all fall out. I paid $3 for 5 pads at Cdn
Tiew and $8 for the hand sander the pads fit on to.

Just thought I would pass that on.

Guess I will forego the barrier coat for now. How does one decide or know
that a berrier coat is needed?

SteveL