Hi welcome to AG, i try to answer your questions, if u wan to top wdgs u should wait at least 12-24 hour until it cured. Why u wan to top it? I think wdgs stand alone just more than enough imho

cmiiw
Big Daddy,
DertoLearN brings up an important point about this particular WG Sealant, to apply it, then wait a good 40-45 minutes before you take it off. Then wait a full 12 hours or more before you do anything else, like apply another product, or wash, or expose to water-rain, etc.
Thin coats, as thin as possible, but insure full coverage. It's a joy to use, and two things you will without a doubt clearly notice.
That WGDGPS looks killer right after wipe off, and even gets better, and glassier-glossier as it cures.
Some folks like applying with the DA, and of course this aids speed in application.
While in the old days, with the ancient Porter Cable DA's, Waxcoa, and Craftsman Waxers, it was fun to use, but lately, I have more fun, and find greater joy-gratification by hand applying Waxes, or Sealants.
These products like WGDGPS, and Colly 845 apply like melted butter on the paint, so luxurious IMO. And the wipe off is the reward, and even more fun.
I feel I can better "surgically" apply such products by hand, not missing anything, lesser worry about picking up a piece of grit with the DA, and scratching the paint, no sling, no spatter means less time IMO cleaning up, the products is precisely placed where I want it, and not other places.
Collinite is the same way. I can probably do a King Cab Dodge Pickup, and use no more than 1oz of 845. After application around the vehicle, it is usually ready to take off where you started. With WGDGPS, take a break, have a refreshment till application times out to 40 minutes or so.
An MF Applicator works OK, but I think one of the snazzy Pinnacle yellow foam Applicators works best. And I've always slightly water dampened any applicator with Collinite products, especially their paste waxes. Helps them go on so easy. And because of this method, they come off just as easy as well.
With either product on the paint, you cannot go wrong. Mark