20-24 Jeep Wrangler/Gladiator Front Bumper Reinforcement Bar

Will this reinforcement bar work with an aftermarket bumper?

Compatibility depends on your aftermarket bumper's mounting structure. If it uses the same factory mounting points, you're good. If it uses a different bracket or frame setup, test-fit before final installation.

Do I need to prime or paint this before installing?

The bar comes ready to bolt on. If you want a finished look that matches your bumper, prep and paint before install — easier access that way. Otherwise, it can go on as-is.

Does this add any weight that affects handling?

It's a lightweight reinforcement, so the difference is minimal. You're not looking at a noticeable impact on how your Jeep drives, but you will feel the added rigidity at the front end under load.