Canvas drop cloth curtains

Hi, I want to do a project turning canvas drop clothes into curtains and I want to paint a border on the bottom. I'm using Rust-Oleum Painter's Touch 2X General Purpose Spray Paint. My questions are - After I wash and dry the drop cloth and paint the border, do I wash again after the paint dries? Or should I not wash the first time and wait to wash after the paint dries? Either way should I worry about paint coming off in my washer and dryer? I rent the home and the washer/dryer is not mine.
Thanks, Mary
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