Foam roller covers are best for high gloss or latex paints. They can also be used with oil-based paint, but, ideally, should be used only on textured or smooth surfaces. Synthetic types are best when using a water-based paint. Wool works well for oil-based paints. Both the synthetic and wool versions can be used on any type of surface.
Paint Roller Cover
Roller covers are not expensive, although all materials used for painting need to be factored into the cost of the overall paint job. Most roller covers are under $15. Wool is usually the most expensive option, followed by synthetic material. Foam is the cheapest.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.