Usually, I use Opti-seal over my LSP. I've been reading some debate whether to apply the sealant before or after the LSP? I'm using Opti-seal and Natty's blue for the two products in question. Thanks.
Scottwax has used Opti-Seal over many waxes with no ill effects. I would not necessarily recommend it with other sealants though (though you can always try and find out).
Oh, But make sure the wax is cured...I would wait at least a day before topping a wax with anything, though I know there are some exceptions to that rule (FK Pink Wax).
As far as I know, there would be no ill effect of laying down OS and waiting maybe a half hour or so and then laying down your lsp. I think many on here do it.
Scottwax was kind of using it as a booster on cars that have been waxed weeks earlier and the customer wanted a re-wax.