sealent

alright i drilled a hole through my floorboard thinking i could drop a bolt down to fix the stripped bolt in the crossmember. now, the holes were 3/8 and too small for a bolt to fit down, i dont really want to leave that hole there for water to sneak in, what should i seal it with?

Get a rubber grommet from your local parts store. Paint up the area so there is no bare metal as well though.