Further to what Frayz said about the claying:

After you've finished the claying process, polish your car with something like ClearKote Vanilla Moose Glaze - you'll find it'll perform better on white than AG SRP, although SRP is still fine to use if you want to. There's no need to stick to one brand of products (apart from the manufacturers that offer 'system' products that all work together), and you'll get the best performance from mixing and matching products that are best for your paintwork. In your case, that'll mean moving away from Meg's after the clay stage.

As for glaze and sealant, all-in-one products work well on white, such as Klasse All In One - although you could use individual products like ClearKote RMG and Poorboy's EX-P if you wanted.

Finish off with Optimum Car Wax - the best performing finishing wax on white cars

Gareth