When I was cleaning up after closing the right fuel tank last weekend, I noticed that I had used AD-41ABS blind rivets instead of AD-41H. The former has an aluminum stem and is not sealed, as opposed to the latter which has a steel stem and is sealed. Today I drilled out the incorrect rivets and cleaned up around the holes. I'll replace these with the correct rivets when I mix up selant for installing the inboard access cover.