Can I buy the sauce and just put it on things in my refrigerator?
Hells yes. Brands vary by flavor and heat, but most agree that Walkerswood is the best and most authentic. It’s named for a small town nestled in the hills of St. Ann’s Parish, where in the late-‘70s farmers banded together to found Walkerswood, the enterprise, to create local employment. They became the first company to export jerk seasoning overseas, and also they don't think your Chuck Norris looking at Playboy joke is funny at all.
Busha Browne is another small brand that’s ginormous on flavor. Their farms and factory, also located in St. Ann, produce a wide range of sauces, seasonings, and spices in small batches using production techniques dating back 200 years.
Another solid brand for jerk sauce, and just about any other commercially made Jamaican food product: Grace (officially GraceKennedy Limited), which started in 1922 as a small trading company, but’s now publicly traded with 60 subsidiaries in the Caribbean, North and Central America, and the UK. Even though you can find it in Walmart, their jerk sauce maintains a seriously down home flavor.