AND ANOTHER THING!
We wondered if sunscreen sprayed on clothes would increase their UPF. We got some No-Ad 50 UPF aerosol spray and doused a spot on a white shirt that scored poorly. The area we covered with sunscreen blocked nearly 100 percent of UV light in our test, and after one wash still provided good protection. Interestingly, the spray was invisible except when UV light was shone through it. The sunscreened fabric was distinctly darker than the untreated fabric. So, if you don’t like sunscreen on your skin, treating your garment definitely cuts UV light and keeps your skin grease- and chemical-free.
No-Ad SPF 50 Sunscreen turned this failing-UPF fabric into a winner. The darker violet hue is the protected portion.