While some of the lesser painting problems can be rectified simply by rubbing it down with a clean cloth and repainting, some require the entire surface to be stripped down and repainted. Here is a list of such problems.
Chalking/Flaking: Very much like how our skin looks when extremely dry. When the topcoat has no firm grip on the surface underneath. This results in the topcoat peeling off in fragments. This is called flaking.
Wrinkling: Wrinkling happens mostly in alkyd paints when the paint is not applies properly. For instance when the paint is applied to thickly or if the topcoat is applied without the undercoat drying properly. Here, like the name suggests, wrinkles or fine ridges are formed on the painted surface.
Blistering: Blistering occurs when bubbles form on the painted surface. On wood, it occurs if the wood is damp. Excessive moisture will result in blisters being formed once the water starts evaporating.
Poor Drying: This happens when the surface on which the paint is applied tends to be greasy. The paint will take a lot more time to dry than normal.
Patches/Uneven absorbency: Patches can either be formed due to staining, which is a different problem altogether or due to uneven absorbency, which will result in matt patches. Here, on some surfaces (more commonly wood surfaces), there might be areas where a primer was not applied. In such areas, the paint will sink into or will be absorbed the wooden surface, causing a loss of sheen and resulting in matt patches.
Most of these painting problems are caused by climatic conditions (too hot or too humid), a dirty/un-sanded/un-dusted surface, a paint layer that is too thick or an improper mix of alkyd and latex paints. No amount of patchworks or repainting can solve these problems permanently. There is only one lasting solution to all the above mentioned problems and that is stripping down and redecorating.