Protection for white wicker ....???

You would need to use a spray paint to get better coverage on the wicker. I would go to a local home improvement store and see what they have, ask an associate if they have polyurethane in a spray can or what else you could use. Are they exposed to a lot of humidity? If so, perhaps something like a marine poly would work well.

i use spray cans from rustloium brand easy to use! Must where a mask and spray it

outside, the paint will last about two yrs for the ware and tear.

You can try Krylon Clear Acrylic Paint Sealer. Be sure the wicker is clean and dry before spraying. Be sure the wicker is completely coated, even underneath. I use Krylon on a lot of different surfaces to protect them, but have never tried wicker. I think it is your best bet, other than painting with a clear oil varnish or lacquer. Either method will turn slightly yellow over time.

We always used high gloss enamel spray paint on them every year to spruce them up.

So sorry to hear you have not gotten a response.

I would clean the wicker well, removing any loose paint. Then I'd paint with a high gloss paint as that wears better outside. It can then be spray painted with a clear polyurethane coating if you feel it is needed.

I remember your question and did answer....Perhaps it did not go through....https://www.doityourself.com/stry/how-to-weatherproof-your-wicker-patio-furniture