there is no rhyme or reason to it. same thing happens to me. if i get a light sprinkle the black cherry is done
. ill spend 4 hours washing / buffing / waxing sealing at the start of a "dry week" and will have rain the next day. it has rained 20 out of the past 30 days here in mid missouri, i have put like 200 miles on it in a month :/