My Western steel stainable entry door is peeling because of the sun. How do I removed the old stain with out wrecking the coating on the steel?

I have stained cabinets that are too dark. They are finished now but they are too dark. Want to know if gel stain on top will lighten them?

Do we need to use a primer over previously painted interior walls?

We are trying to paint with high gloss enamel after using oil base Kilz. We have allowed two hours in between, it is very tacky. Not painting evenly on this smooth wood headboard – we have just one coat of paint on so far but its not pretty, flowing brush