You can use a thinner to make the paint flow more smoothly. Use a liner brush and clean up the edges of your stroke. Also, you can use a dry brush or another type of brush with a smaller tip to blend in your strokes.
Apply your paint with feather-light strokes, starting from the center of the touch-up area. Work your way out from the center, feathering the edges as you go. ``Feathering'' just means that you extend your brush strokes a bit beyond the touch-up area so that the new paint blends in nicely.
Tip #1- Lower Sheen The easiest way to paint without brush marks is to paint with a matte or chalky paint. Flat paint hides imperfections, including brush strokes the most. My absolute favorite matte paint is this one by Fusion Mineral. It comes in lots of trendy colors and is pretty durable on its own.
Dilute your paint and grab a brush or roller (use whatever was used to apply the previous coat of paint) and lightly apply a touch-up coat of paint, feathering it and blending it out into the original painted area so that there are no hard touch-up lines.
Prime the Area
Applying a light coat of interior-grade latex primer can help the touch-up paint blend into the surrounding wall, and will promote better paint adhesion. Use a small brush to prime the area you prepped in the previous step and be careful not to paint too far past the area you're touching up.
Use a Roller
Rollers are great for getting large sections of paint on walls without having to worry about brush marks!
With a paintbrush or roller (ideally the same application tool used for the original paint job), start with as little paint as possible, applying a very small amount at a time. Slowly roll or brush over the imperfection, making sure to start in the middle and apply the lightest amount of paint to the outer edges.
If given a choice between a brush and roller, always use a roller to perform the touch-up.
What Causes Brush and Roller Marks? Application of additional paint, or re-brushing or re-rolling, in areas where the paint has partially dried. "Working" paint too much during application (e.g., applying too quickly or for too long).
Walls, Wood, and Metal - Small 1/4″ roller covers or foam rollers will produce the smoothest finish. Light to Medium Textured Surfaces - Microfiber rollers are best.
The main problem is that wicking will not occur at the same rate on a touch-up job versus the wicking rate of the original top coat. It is virtually impossible to reproduce the exact wicking rate, and this is why a touch-up job will often appear as a slightly different color than the original paint.
Patchy paint can result if paint has been applied unevenly. Patchy paint can be down to a variation in surface absorption. Walls might appear patchy if they have variation in texture. Using paint that is not fully mixed can cause a patchy appearance.
To ensure better color blend and adhesion to the surface, primer is a must. Prime the part of the wall you have cleaned and repaired. Use high-quality latex primer, and don't go beyond the area you'd like to touch-up.
Having a fresh-looking wall in your living place doesn't require repainting all the time. Touch-ups can easily freshen up damaged walls with unsightly marks and blemishes. Maintaining an aesthetic wall demands the proper technique and the right house painters to give a flawless touch-up to patchy wall areas.
Professional painters typically use both brushes and rollers when painting. Brushes are used to apply paint in tight spaces or areas with intricate details, while rollers are used for larger surfaces like walls and ceilings.
To ensure a smooth finish, you'll want to use a brush with very soft bristles that won't leave brush marks. You can also use a thin nap paint roller for a smooth finish, provided your surface is flat and doesn't have any nooks and crannies. It's also important to use painter's tape when painting.
Without primer, the touched-up spot will stand out, and it'll look a right mess. The trick is to blend the new paint with the original surface. Priming will also prep your surface for paint and seal any stains - especially those that wouldn't come off.
Flat finishes often require fewer coats than semi-gloss and gloss paints. They are also easier to touch up; there is less contrast between the touch-up paint and the rest of the painted surface. On interior walls, flat finishes are ideal for low-traffic areas such as formal dining rooms and master bedrooms.
Use a roller, if possible — A roller will give you better quality and blending than a brush. The preferred roller is a "weenie" roller with a good, quality synthetic cover. Choose a nap thickness of ¼ - to ½ inch. Use less paint — When loading the roller, use the least amount of paint necessary.
The real trick to making your touch up repairs invisible comes 2-3 days after the colour and clear coats have been applied. Get a bottle of low-grit rubbing compound and carefully work a small dab over the repair area with a microfibre cloth to smooth out the paint bump.
A dedicated touch-up brush is one of the most affordable tools to improve your results significantly. This 100-pack of 1.5 mm brushes from Atlin gave me a much more precise touch than the chisel tip of the included paint pen. It also allowed me to control how much paint went into the scratch.