Lightly sand the troublesome area with 150-grit sandpaper, then tack the walls. That's painter lingo for “Wipe it with a cloth to get rid of dust.” (Easier than the lingo makes it sound!) Then re-paint the area, maintaining a wet edge—meaning, don't let the paint dry until you finish the wall.
You can either skim-coat the entire wall and sand it all smooth to even put, or you can sand the repairs back a little better and use a longer nap roller with higher solids paint (or an extra coat) to give a nice heavy texture that will hide a multitude of surface imperfections.
The rough marks, are most likely from the paint drying too fast when you were painting. This happens with all the newer paints. It is best to add floetrol to extend the drying time, so if you roll back over something it will still be wet, and it wont leave those rough marks.
Touching up with even slightly uneven distribution of color tints will show. Use a paddle attachment on a drill for best results. I often use a 1/2 inch mini roller for touching up, and roll up and down. Never sideways. This is to mimic the up down direction of the original paint texture.
The answer is yes! Retexturing can breathe new life into your walls.
Applying the second coat too early will result in lost time, money, and effort. Not only that but it'll also create additional stress that's not necessary. Applying the second coat too early will result in streaks, peeling paint, and uneven color.
You did not sand in between coats of paint. Not only is it important to sand between primer coats, but also between coats of paint and especially between coats of topcoat. If you have primed your piece, each coat is less rough, but I always do a quick sanding just to be sure.
If you want your paint to have a smooth finish, the technique you use is very important. Keep your brush at a 90-degree angle while applying the paint and feather as you go. Between coats, sand the wall lightly using a very high grit sand sponge of at least 220 grit.
It is easy to smooth out touch-up paint with lacquer thinner. Simply wipe and dry the area, dab a small amount of the solvent onto a cotton swab, and massage the paint glob away slowly.
Old paint might have debris or clumps (even if it's an unopened can!) and new paint might need to be stirred.
Smooth Finish: No one wants bumpy, patchy walls. PVA drywall primer smooths out inconsistencies in texture, making the final result look silky smooth.
How to fix uneven or blotchy paint: No matter how many additional coats of paint you add, this problem likely requires going back to the drawing board. If you run into uneven or blotchy paint, the best thing to do is start over.
Recoat Time for Oil-Based Paint
Water-based paints dry considerably faster than oil-based paints because the water evaporates to let the paint dry. Oil-based paints contain no water. Though oil-based paint may feel dry after only a few hours, it's best to wait a full 24 hours or more before applying additional coats.
The wait time between paint coats depends on the paint type, the surface, and environmental factors. Wait 2-4 hours for water-based latex paints, while oil-based paints may require 24 hours between coats for optimal results.
Applying the second coat of paint before letting it adequately dry will result in your paint peeling, clumping, and bubbling. It can also result in a different colour than what you intended.
The trick to removing textured paint on walls is to use the proper grit of sandpaper. If the grit is too fine, you'll have little luck sanding away the textured coat. Using sandpaper that's too rough means you could damage the wall and leave uneven spots. For drywall, use 120- to 150-grit sandpaper.
Give your piece a full sand with a very high grit sandpaper!
A butter smooth sanding all over with change your piece dramatically. Use 400 grit (or higher) piece of sandpaper all over your piece and I PROMISE you that you WILL feel a difference. I use this one, but any soft sandpaper with a high grit will work.
If you want like smooth smooth prepare yourself for a lot of work and dust. Start by getting a bucket of drywall mud(topping/finishing compound, not joint setting) and a 14" knife & pan. Thin the mud till it's like pancake batter and skim coat everything. Let it dry then block sand it smooth 220grit is high enough.
For example, textured ceilings, are highly absorbent and will, usually, require two coats of paint. To ensure optimal results, a first coat of primer should be applied to the textured ceiling. The colour you choose can also affect the number of coats needed.