Z8 works very well with all the sealants I use. I just love it when used with Acrylic based sealants. I use it mainly as a sealant topper for it's "spray sealant" like qualities. FK #425 is just a terrific all around gloss enhancing QD spray with really no "protective" qualities. Just amazing gloss! Both are great products & I suggest alternating them weekly. At the moment, I've got the CG Creme Glaze/ Micro Seal combo on my black truck. I'm using FK #425 after each wash & then the following week I'll hit it up with Z8. (425 wk 1, Z8 wk 2, 425 wk3, Z8 wk 4.....etc) This method works very well for me.