My guess is that he used Kemper Systems Kemperol 2K.
Good for us that Trump knows about construction and knows the right questions and the right people to do the job.
He did exactly what I would have done. It will last for 50 years or more. Then, you just recoat it for another term. Good stuff.
What can I say but....IT’S A JOB WELL DONE!!!!!!! It’s amazing what can be done with just having the right person the job.