From HD Speed's product description page:
First this:
"Polishes and protects painted surfaces in one easy step.
3D HD Speed is an all-in-one cleaner, polish and Sealant..."
And then (later on in the description) this:
"HD Speed removes light imperfections, increases gloss significantly,
and lays down a durable coat of Wax all at the same time".
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Irregardless:
•Many people feel the protection offered by an AIO isn't adequate, and will add an additional film-layer of either a Sealant or Wax to the AIO.
As such:
•I can see where adding a film layer of WGDGPS 3.0 will be beneficial to the beefing-up of the HD Speed's protective qualities.
Bob