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I don't know what a polyfill filter is. but what I did was I put waterproof masking tape over the holes. Then put tinfoil on the top, just covering the lid. This has worked out pretty well for me. (at least on the first half of incubation.
no you dont need foil after you inject the spores, that would pretty much defeat the purpose of the filter (good air exchage). you need foil over the whole top of the jar when you pc or boil.
your jar will become overwatered if you don't have foil over it while pressurecooking or boiling. however it might not and could still grow.
-------------------- "one day we'll be able to model your brain as a mathmatical equation. since the number of equations possible for the human species is NOT infinate, we will ALL live again"
-Me