I only re-wax NEW small cell plastic frames when I have the time. IMO it really helps get those odd frames drawn out correctly. The rest just go in the hives and the bees comb them up fine; at least this time of year in MI. Scraping down frames still leaves wax on the frames and bees work them just fine. Of coarse you've got to have a descent amount of bees in your hive for them to build comb in the first place.