Short of welding all the pin holes, your best bet is to use a liner.
Do a search for Por15 or Caswell plating have a good one.
I have used Kreem several times with good results but alot of people don't like it.
Whatever you use it's all in the prep and following the directions to the letter.
The longer you let the liner cure the better, give it a week and then re-coat if need be.
Gary