holes in pump shoe

At the begining of summer i swapped out the AM intake grate that came on my 90 SN. (i just got this ski in may 2017 and its my first one) When i pulled off the old intake grate, i thought nothing of bolt length, when i installed the new one i followed the directions. "short bolts in the rear" i also added some poly to the new bolts that came with the intake grate.
well when i put it all together i stuck my hand in the pump housing and got a bunch of black urethane on my hands. i tought i was just messy with my urathane but now im certain the pump shoe has 2 holes in it from the first time the intake grate was changed.
what have i risked by running the ski all summer like this?
 
thanks! yes it is the pump shoe. i didnt notice any cavitation so hopefully the poly sealed it. im going to have it apart for the winter, is there any benifit to an aluminum pump shoe vs stock?
 
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