I have painted the holes with two coats top and bottom. I'm letting the paint get a good cure then insulating the whole floor with peel and stick roofing patch like I did for the wheel wells. That should be enough to seal all the holes I have developed.
I have to say I could strangle a Ford Engineer over this one. The cab is riddled with unnecessary and unplugged holes. Of course water was going to come through, and once it did it was trapped by the shredded cotton underlayment until the floor rotted. Totally predictable and easily avoidable.
I have to say I am so glad I caught this right now. Any longer and it would have been a total disaster.
FYI a quart would have done the whole cab floor with 2 coats. I sprung for a gallon and will be doing the entire frame and what I can of the moving parts for both my vehicles.
Also I have tried every kind of heavy duty solvent available commercially and on the remediation job site I've been on and nothing will take the POR-15 off once it sets in your skin. Have a bottle of lava soap handy! I nearly got stuck with a Hitler stash for weeks!
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