Okay I was watching the ridiculous amount of rain come down over the last couple of days, and I am doubting the performance of HD wax... Yes, it still beads but it does not sheet water properly like it did when first applied (only 1 or 2 weeks ago). I have a 6 mile drive to college (up to 50mph in some places) and a lot of rain water had not run off the car by the time I had reached it.
I decided to go for some FinishKare 1000p Hi-Temp wax in the hope of greater performance than AG HD wax, added to the fact that it's meant to be really glossy as well (unlike HD). It cost only £18 (with £3 delivery) for a larrrgee 15oz pot, and will be trying it out on Friday after my exams have finished.