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James Lamb · 03-13-2019, 10:49 PM

Undercoating. Yes.I have seen the cheap stuff drip off. But have also used some rubberized undercoating that held up well. Putting the first coat on too thick rather than as 2 or 3 light coats is a problem.

But in high school I bought a 1959 Triumph TR3. Almost the entire drivers floorboard was rusted out. And there were other bad spots too. I was on a budget, to put it lightly. I had to use what I could find lying around the farm to fix it. I cut off the sheet metal from the outside of an old hot water heater that had not made it to the dump, made a new pan. Got a gallon bucket of roofing tar and some mineral spirits, thinned out the tar and spent most of a day under the car painting every surface I could find. That was in about 1981. I still have the car and no rust has penetrated anywhere that was coated in tar.

So it can work. But yes coating everything can be an issue. You just need to find a motivated 18 year old.

03-13-2019, 10:49 PM	#30
James Lamb Registered User Join Date: Mar 2019 Location: Knoxville AL Posts: 74	Re: Daily Driving a Square Suburban Undercoating. Yes.I have seen the cheap stuff drip off. But have also used some rubberized undercoating that held up well. Putting the first coat on too thick rather than as 2 or 3 light coats is a problem. But in high school I bought a 1959 Triumph TR3. Almost the entire drivers floorboard was rusted out. And there were other bad spots too. I was on a budget, to put it lightly. I had to use what I could find lying around the farm to fix it. I cut off the sheet metal from the outside of an old hot water heater that had not made it to the dump, made a new pan. Got a gallon bucket of roofing tar and some mineral spirits, thinned out the tar and spent most of a day under the car painting every surface I could find. That was in about 1981. I still have the car and no rust has penetrated anywhere that was coated in tar. So it can work. But yes coating everything can be an issue. You just need to find a motivated 18 year old.