[BRENT in 10-uh-C]

Considering that most of the bottom side of a Tudor is wood (with the exception of the rear seat pan), I am assuming you are speaking of the subrails ....which most are obscured by the frame and/or body aprons. So just a question/suggestion, what would happen if once or twice a year you would spray a heavy dose of Penetrating Oil over the entire bottom side?

What I am wrestling with is are you really curing the rust issues by the methods described above, ...or giving yourself a false sense of security? I often use the phrase "exactly where do we sever the bleeding artery?" ...meaning where do we start and stop? Lifting the body sounds like a great plan, ...and it would be even better if the body were then mounted onto a rotisserie where everything could be rotated into proper view. Heck, why don't we go ahead and remove the 4 floorboards and tape up the interior where we can thoughly do both sides of those subrails. Matter of fact, you might should remove the lower upholstery panels so we can gain access to the seat pans and subrail area there too. Then you gotta paint it thoroughly so you better tape up/remove the interior upholstery so-as not to get overspray on it. Keeping with this silly mindset, before you know it you are WAY past the simple thought of preservation and into restoration (especially if you find hidden rustout or cracks). So, --will a couple of annual dosings of penetrating oil curb the rusting enough to preserve what you have for another decade or two until the vehicle is "re-restored" again? Most Model A's that I know need to be 'freshened' after 40-50 years on the previous restoration. Maybe your areas of concern could wait until the next go-around?