When working with a body each stage, even the minor and on the first sight insignificant one, is important.
M
aterials quality influences both their durability, and convenience of work with them. Qualitative putty is laid down smoothly, quickly dries up, gets easily sanded and won’t subsequently exfoliate together with a ground and a paint.
Professional paint when used skillfully does not leave runs and wavy stains. But these are foreground layers which are very easy to estimate visually. The background layers are like underwear they remain hidden and can deliver many problems later on.