I was gonna spray but the forecasters are saying wetness is likely for most of the week so I’ll have to hold off.
A good sticky agent (surfactant) will dry in 15 minutes or less LI 400 is a good one. RoundUp ProMax - expensive (about $80 for 1.67 gal), but includes a very good sticker agent (dries in 30 minutes) advertised: 40% coverage, 100% dead. Only need 1.3 oz gal per mix.
Surfactants are useful for two reasons - fast drying and stops plant respiration (sort of seals it off).
Label: http://www.domyownpestcontrol.com/msds/Roundup%20ProMAX%20Specimen%20Label.pdf
BTW from the label:
Carcinogenicity Tests
The results from extensive, chronic toxicology tests resulted in a U.S. EPA cancer classification of glyphosate as a “Category E,” or “evidence of non-carcinogenicity for humans,” the most favorable rating granted. This rating is based on a thorough review of results from extensive toxicological testing required by EPA.