Quality levels in both types of filaments can vary hugely and therefore levels of finish can differ depending on what type of brushes you purchase.
Synthetic filaments do not absorb much water and can be processed to create a very finely-tipped paint brush. This makes them particularly suitable for use with water-based paints such as emulsion or modern water-based undercoats or gloss paint. These paints dry quickly making it difficult to avoid brush marks in the finish when using a natural bristle brush.
Natural bristle brushes perform well with oil-based products.
A number of modern paint brushes will incorporate a mix so that you get good coverage with all types of paint. As a general rule, use natural bristle for oil-based paints and synthetic brushes for water-based paints.
Here's a rough guide, but most of our packaging does have advice on typical job or task for the size of the brush.
4" - 6"
These are wide brushes for painting over large, flat surfaces like walls and ceilings.
2" - 3"
These size brushes are a good size for painting all types of flat surfaces, such as a small section of a wall and woodwork like doors and
skirting boards. These size brushes can also be used for more accurate work such as door edges and wall and ceiling edges.
1" - 1.5"
These are smaller headed brushes which are good for 'cutting in', which is painting close to the edges of walls and ceilings and around light switches - also mouldings and doorframes.>
A narrow headed brush with angled bristles for painting near to edges and into corners. Ideal for painting window frames.
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