I would still strip that Klasse. It is just a polish and you want a sealant to seal to the paint not be on top of polish.

Zaino. Use the Z-2 Pro with ZFX additive. (also if you have leather their leathe stuff smells great ands works very well)
This 8 oz bottle will do your car at least 8 times. Use very sparingly. Just when you think you have it right use less.

As a second choice the stuff (pro paint sealant) at www.perfectautofinish.com

I have tried just about all of waxes/polish and these two would be my choices for sealants/polishes.