Fine oil finishing — polyester is the water-based fill; for furniture-grade varnish or oil enamel, a soft white-bristle-style brush (Hyde's Extra™ flats) is the specialist.
The set also holds no angular sash brush, so for the crispest cut-in line you'll still want a dedicated angled sash.
And a starter set is a starter set: for a repaint that shows lap marks or any finish-critical latex, step up to a flagged or SRT-grade brush.
Because the set is polyester, treat it as water-based tooling
load about a third of the bristle, keep a wet edge (latex flashes faster than oil), lay off lightly, and — the move that turns a cheap set into a lasting one — wash out in warm soapy water before the paint sets, working the water into the heel where filament meets ferrule, then reshape and hang. A synthetic brush lasts for years if the heel never fills with dried paint. Match the brush width to the member: a face wider than the work rides its corners onto the neighbor; a face too narrow turns a big surface into an afternoon.
Asked at the counter
BUYER QUESTIONS ANSWERED BEFORE THE CART, NOT AFTER THE RETURN
What's in the set?
Three straight polyester flats: 1", 2", and 3".
Latex or oil?
Polyester — use it for water-based paints; for oil finishing choose a white-bristle-style brush.
Is there an angled brush in it?
No — all three are straight flats; add an angular sash for cutting in.
Why buy a set instead of one brush?
You get the full common width range in one purchase when you don't yet know which the job needs.
