Using a thick primer for painting projects can provide better coverage, hide imperfections on the surface, and create a more even base for the paint to adhere to. This can result in a smoother and more professional-looking finish for your project.
You don't short of buying a better primer. I usually find it too thick.
Primer can sometimes be sticky if it does not dry well or is put on too thick. In most cases where there is low humidity a primer should not be sticky.
Depending on what type of spackle you are using and how thick it was applied it may need to dry longer, but you also need to prime the spackled area before painting. My experience has been to use an oil base primer and any type of paint can be used over it, oil primer works well for a bathroom.
I find your meaning a bit difficult to understand. -You don't paint and prime together. -The primer must be applied first and become totally dry before painting is carried out. If you're concerned about covering ability, use a good thick primer like Kilz. It will completely hide anything. If the masonite is pre-primed, then a paint and primer in one will work fine. If it is bare, then you need to treat it like wood and either give it two coats of the paint and primer in one, or better, give it a coat of primer, then paint.
A thick, oil based primer, like Kilz.
impasto
It might stop some checks and cracking if it is thick enough and you put it on the ends...
Hog hair brushes are known for their durability, stiffness, and ability to hold a lot of paint. This makes them great for applying thick paint and creating textured brushstrokes in paintings.
The painting was just a series of daubs of thick paint.
To achieve a smooth and even finish when applying thick primer paint, the best techniques include using a high-quality brush or roller, applying multiple thin coats instead of one thick coat, sanding between coats to remove any imperfections, and ensuring proper ventilation to allow for even drying.
Not worth trying. -Just paint over it with a good thick paint like Behr premium.
The subfloor plywood typically used in construction projects is around 3/4 inch thick.