I can't tell what yours are made of but mine are particle board,caulked and painted with outdoor paint. Mine are out for the whole month most years and have been for 13 years in all weather. Still holding up fine with touch up paint every few years.I have been debating over the last couple of weeks on weather I should weatherproof the tops of the cemertary columns with satan spar urethane. I live in the pacific northwest and will be putting them out two weeks before halloween. They are sealed with caulk and painted with outdoor latex paint. Should I leave them or use the urethane? My concerns with the urethane is discoloration and if I need to repaint them someday I would have to sand the urethane. So what do you guys think?