I use Optimum Opt-Seal and it works good with a regular foam applicator. But I find that the opti-dual applicator works even better. It spreads out opti-seal easier and more effortlessly compared to a typical foam applicator. A typical foam applicator can sometimes drag on the paint with opti-seal. Another plus is that opti-seal won't get all over your hands when using the opti-dual pro applicator which happens with a yellow foam applicator. A must have for an opti-seal user.