i don't know about using poly batting- since poly melts when it gets hot---i used warm & natural on mine which seems to be the same (padding/cushion) as my store bought cover. i also purchased (ironing board cover fabric) from joannes, (the silver stuff) which has kind of a teflon coating which helps the iron glide and works very well. i have a friend who went to a thrift shop and purchased a couple inexpensive flannel sheets- folded them to size and used them for her (batting) she says its the best ironing board cover she's ever had- she also used the silver- ironing board cover fabric- i've seen a heavier (grid marked canvas) fabric available too.- seems to me a pieced top would interfere with good smooth pressing...but i've never tried it.