The cure time for the LVR 403/LVR 404 (or really any acrylic based product) applies more for detergent washes. You don’t want to have any type of detergents come into contact with the acrylics before they’ve had a chance to set. If an acrylic gets hit with a detergent before its had a chance to fully cure, it’ll basically fall apart and will be worthless. You can typically apply a topper within an hour of using the LVR 403 or LVR 404.
LVR 357 Magnum Wax isn’t applied like a typical wax. It won’t “flash” like you would normally expect a wax to flash. Instead, LVR 357 Magnum Wax will start to get “tacky” to the touch after about 15 to 20 minutes. Once Magnum start to get tacky, then you can lift it off and buff like you would normally due to a wax. After that, you should be able to apply PolySeal anytime after that.