That's because those are really just for prep work and such. You need at least a 12 oz heavy duty (yours is 8 oz) or a poly backed canvas drop cloth. This link explains the differences. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pmrC_bOROh4.htmlsi=SjS0hjaoJQJ0Br5X