Floor board.

[MSL]

Well i had a chance to pull up the old rubber mat and the lining under it whatever thats called. well anyways my door weatherstriping is gone so its leaking inside when it rains so i got all that out and man i was thinking this floorboard is going to be bad crossing my figers hoping its not and i pull it all up and sigh of relief its got some rust but nothing i cant fix. now i have to get to work and get that sealed and new striping on the door and new door strikers since they are worn out and readjust my door.
What do you all use to take it up and seal it.