porous

This kind of defect isn't what you expect to see in a modern bike, this is from a Hyabusa which also was victim of a careless assembly by someone prior to the current owner. They didn't replace the hollow dowels for the cam bearing/covers.

Hi, On my old 85 max, the water joint seems to be porous. I can paint it, but after a couple of months, the paint gets blisters and falls off. Does this also happen with the newer joints? Also, there are after market parts like below, but all I can find are custom CNC pieces that are out of...