It's generally best to wait before using a clay bar on a new paint job. Fresh paint needs time to fully cure, which can take anywhere from 30 to 90 days, depending on the type of paint and the conditions in which the car was painted. During this curing period, the paint is more susceptible to damage, and using a clay bar too soon could potentially mar or disturb the finish.

It's also important not to use too much pressure when working with a clay bar – this can cause damage to the paint such as scratching or micro marring which makes it look dull. If your vehicle has recently been repainted, waxed or has had sealant applied, then you should avoid using a clay bar.

What You Should Do:

• Check with the Painter or Body Shop: Ask for specific advice on how long the curing process will take for your particular paint job.
• Avoid Clay Barring Until Curing Is Complete: Once the curing period is over, it's safe to use a clay bar if needed to remove any contaminants that might have settled during or after the painting process.
• Gently Test for Contaminants: After the curing period, you can lightly feel the surface to see if there are any contaminants embedded in the paint. If it feels rough, then you may use a clay bar with proper lubrication.

Waiting ensures that the paint has fully hardened, reducing the risk of accidental damage.