I like Sonax Polymer Net Shield. I`ve used it on decent un-prepped paint and I didn`t have any issues. Its durability is excellent and it self cleans very well, looks good too. Beading is off the charts. The only negative...application/removal is more grabby than other sealants, but it`s not too bad. Also, their Brilliant Shine Detailer is very good as well and very durable for a QD. IME, due to its somewhat thick consistency, it`s more of a spray wax than a QD.