The best spray sealer/wax on the market which isn't stupid money is this by Carpro. it blows everything out of the park by miles, Ive got a bottle of the Acrylic spritz by dodo juice and it doesn't come close car pro reload.
http://www.ebay.co.uk/itm/140961565165?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I personally don't really rate Dodo juice supernatural. I find it doesn't have a very long life, after a few weeks mine used to stop beading, I switched to autoglym HD wax and its miles better. Goes on easier, comes off easier, cheaper, has a great shine and if you give it 2 coats will still be beading like crazy for 2-3 months.
DDSN might have changed their formula since i had it (been about 3 years) so i don't know if its improved, but i won't be going back to it.