Any advice most gratefully received

I fitted a single wire alarm to my bongo on the weekend - very straightforward even for me and fit for purpose as I just want to protect the Bongo when we are camping etc.
However I had to reposition the bracket for easier access so I'm left with 2 additional holes as well as the three supporting the bracket After much frustration and ruined cross threads etc. I got the alarm positioned but due to the additional time I neglected to paint any of the holes with hammerite as planned. My question is should I be worried? I have a two battery 1998 AFT, I'm just worried the holes may rust very quickly given the various discussions on this forum
Many thaks in anticipation
Abewin