How do I remove dark spills of paint off of white border?

Looking for shutter and front door paint colors to go with light blue siding?

I just applied one coat of semi gloss paint on my walls. Can I paint over top of it with a satin finish without sanding or priming?

What is the very best exterior cold weather house paint for wood siding? Temperatures in Wisconsin winters can reach -30 degrees where I live.

How to bid popcorn ceiling removal job, re-texture and paint?

I know I’m going to have to make sure the ceiling, windows, floor, and door are covered. And I’m going to have friends help me with a lot of it, so it wont be as much work as it would myself.

I painted one coat of Kilz to the ceiling, then added Homex sand finish to the Kilz for the second coat. After doing so, there are several places where it did not cover evenly with places that did not have any of the sand texture at all. I used a

Does sizing need to be removed or sanded down before painting? If so how?