Paper cone paint strainer for latex paint
Throw out the rusty paint, move on with life.
Get a colander from a thrift store.
Buy the &quot;5 gallon&quot; filter and set that over your ring so that you
can use just part of it (perhaps with some clothespins to hold it in
place.)
(non-ripped) nylon stocking. Or non-ripped portion of ripped nylon stocking.