3 Reasons to Use a Tarp Instead of a Waterproofed Picnic Blanket

Waterproofing spray or wax won’t hold up against wet sand The abrasive sand wears the coating off quickly with folding and shaking, and moisture still wicks through the fabric where you sit.

A cheap polyethylene tarp works better It’s fully waterproof, sand shakes right off, and it’s lightweight. Just throw a thin blanket on top for softness.

If you want one blanket, buy a dedicated waterproof picnic blanket These have a bonded backing, cost about $30, and last years. Don’t try to reinvent the wheel.