The only material you want to plug and repair those holes with is a two part repair such as. Your choice they are all great. Best bet is pick the one your jobber stocks for ease of replacing as needed down the road.
These products are either--Epoxy base, Urethane or polyurethane.
Duramix, 3M, Fuzor, Sem, Norton, there are more and they all require a special gun.
I'm more in tune with the Duramix so that number is 4050 a one minute work time.