I bought one LED bulb to test and found that it pulled the fixture down about a half-inch. Do I need to replace the fixtures, or can I attach the fixtures to the ceiling with some type of glue or small screws?
Or, give it two coats of a marine varnish or exterior polyurethane varnish.
The painted treads will soon scuff and wear because both climbing and descending steps produces a scuffing movement, which will ruin the steps quickly. The only cure is to install carpet treads, which cover only the treads, curling over the front edge of the treads. More expensively, install a carpet runner, covering treads and risers the full length of the stairway.