It should work without any problems as our Hybrid Wax works great as either a standalone wax/sealant, or as a last step product.
If for some reason you are having problems when applying, it could be because the special polymers in our Hybrid Wax sometimes don't work well when applied over typical car waxes and sealants, unless it's a full synthetic polymer based product such as our CarGuys Liquid Wax.
And if it doesn't end up working, don't worry about it! We are so confident in everything we sell, every product is backed by our Zero Risk Policy. Use the product once, or use the entire bottle.