I sprayed some Axiel Extreme ipak on barley today and then it rained about 10-15mm in a thunderstorm. I started spraying at 1:30pm and finished around 3:00pm. It rained around 4:30–5:00pm. The rainfast time says 1 hr but im concerned it was a waste of time and money because it rained hard. Is there going to have been enough time between the chemical application and the rain? What do you think?