How many coats of primer do I need on new sheetrock?

I have just painted my stair wall in Magnolia. The wall has a mahogany dado rail. The paint seems to look darker at the bottom. I have applied 3 coats (bottom was green before, top was always Magnolia), used same tin of paint for top & bottom, any ideas?

I put a metal primer on my metal doors then I used a solid stain. It turned out to look good but it is very dull. Is there a finish I can put on top?

Paint keeps cracking on interior wall. Scrapped off paint and re-plastered the wall, waited a week and the same thing has happened. Can any one help?

I am building a cabinet for my house and I want to glaze it. I have painted it with oil based paint and need to seal over the glaze. I didn’t want to use polyurethane because it ambers over time. Is there a product to use that does not amber

What it the 1st step to do when I want to apply oil base primer on top of semi-transparent stain + solid stain (both oil base)? Homeowner wanted to paint instead of stain. Started getting blistering in different locations of the house, when I applied Cover Stain, oil base primer.

Can I buy paint tint to mix with my base paint for interior walls?

Do I need to prime a flat paint before repainting with an egg shell or satin… also in the bathroom do I need a different type of paint?