Mop sauce is thinner in consistency than bbq sauce, often with a vinegar base. The mop sauce is used to baste meat every 20 minutes or so over a long cooking time on the grill, or smoker, at a low temperature. u003cbr/u003eu003cbr/u003eBBQ sauce should be applied at the end of cooking meat since it's thicker and has a higher sugar content. If the BBQ sauce is applied too early, the sugar in the sauce will burn.