The sanding will help give the primer some additional grip while the primer will help the actual paint last.
The Spruce / Claire Cohen
Warning
Always use a dust mask when sanding.
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The Spruce / Claire Cohen
Sand the first paint coat by smoothing down bumps and inconsistencies.
Painting directly on bare wood is not recommended.
First, apply a primer to the bare wood and paint.
The Spruce / Claire Cohen
If the painted surfaces are in good condition, you may be able to skip the primer.
Prime unfinished or bare wood before painting it.
If the wood will go outside and be exposed to the elements, it must be sealed after painting.
The Spruce / Claire Cohen
Renovation, Repair and Painting Program: Do-It-Yourselfers.
United States Environmental Protection Agency.
The Spruce / Claire Cohen
Claire Cohen
Claire Cohen
The Spruce / Claire Cohen
The Spruce / Claire Cohen
The Spruce / Claire Cohen
The Spruce / Claire Cohen