Passport Problem Perhaps

During sonkran I managed to get my passport wet, or slightly damp, a few pages with old stamps from previous years have become smudged, don't know what sort of ink they use in those border stams but they don't like water, all the main pages are fine, the last stamps from my last border run are fine, my visa is fine, surely past pages of stamps etc are of no interest, if I replaced my passport tomorrow they wouldn't be there anyway.

Also is it ok to do the visa run on the exact stamp date of your 90th day, I was going to go today but the weather is crap so waiting till tomorrow which is the expirey date of my 90 days.