yes would make it harder to scrape, but maybe a good hard brush rather than a scraper, also if you were able to get them out would make it a lot easyer, I find with the smooth side up its not just birds slipping.but the shavings seam to just slide about, I dont know maybe the smooth side could be roughened up a bit, or would that spoil it, need to get my thinking cap on, pity its not possible to have material so they could be hosed down ,