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Leaking hot water radiators


I am new to the forum and hoping to find some help. I recently had two old cast iron radiators from my 1900s Philadelphia row home (which had been in perfect working order) sand blasted and powder coated by a local place. After hooking them back up and starting to pressurize the system, I discovered that there were small leaks between multiple sections of the radiators. I tightened down the bolts on the sides, which seemed to work a bit for one of the radiators but not for the other.

Does anyone have any other suggestions? Do I have to scrap my beautiful new radiators?