Usually a second or sometimes third coat will cover the white show-through. If you later on wish to change the dark color to a light color, you will definitely need to primer the wall probably with two coats before bringing the color back up to a lighter color.
The sap in the wood will bleed through latex. It needs to be primed with an oil based primer such as Kilz.
Clear primer.
You will need to rough the varnish up with sandpaper then use a bonding primer.
Look, I've been painting for a long time and all I can say to you is Good Luck. You will never remove the primer from on top of the paint. Sorry.
Latex Primer dries fairly quickly. It will depend on the humidity levels in the home and the surface its applied to. On new drywall which the surface is more porous and will absorb more primer vs previously painted. Usually you can apply a top coat in 2 - 4 hours. Rick The Renovator
Primer is under the paint.
Yes, you can use either latex or oil based primer.
Yes it can.
Yes, you can. Primer will grip to almost any painted surface.
Primer.
Clean it, fill any minor holes, then primer it.
yes. I painted some eucaboard, but used primer first
Using primer is necessary on interior walls or ceilings when the surface to be painted is new or newly repaired.
In general the primer bulb draws fuel from the tank through the carb and then returns it to the tank. Look for "carb" and "tank" on the primer bulb and make the respective connection. A line should come from the tank to the carb. Another from the carb to the primer. and another back to the tank.
The sap in the wood will bleed through latex. It needs to be primed with an oil based primer such as Kilz.
Clear primer.
It sucks gas from the gas tank to the carborator using nothing but suction In general the primer bulb draws fuel from the tank through the carb and then returns it to the tank. Look for "carb" and "tank" on the primer bulb and make the respective connection. A line should come from the tank to the carb. Another from the carb to the primer. and another back to the tank.