What do I have to do to prep a never before painted exterior metal door? What kind of paint would be the best kind to use?

We have a white vinyl sided two story center hall colonial w/ red shutters & door. What color should I paint the foundation?

I have kilzed a room with oil based primer. The paint that I bought is water based. Is that OK or does the paint have to be oil based as well?

After putting a second coat with a different kind of paint the second coat GUNKED UP, peeled off while still wet. This second coat was applied days later, so the first coat was dry.

Whats better satin or semi gloss on trim?

I have a staircase in my living room. Now I want to paint the staircase wall one shade of teal and the living room another shade of teal, darker shades of teal with banister and trim. Which should the darker teal, living room or the stairway?

I painted my bathroom a sky blue and would like to put something on it to tone it down, like rag it or something…and my bedroom is gray and I wanna do the same thing, but brighten it up..

What kind of water based sealant can I put on top of a restained fiberglass door?