[chopper526]

I was watching one of those car shows this weekend on the Velocity channel and they used spray on bedliner as an undercoating on a Camaro. What a great idea and I don't think I've ever heard of this before. Anybody else try this? I wish I had thought of this when I did my coupe.

[ghost28]

I bet that would be a tough surface, and could with stand all that salt on the roads.

[madmike3434]

that spray on bed liner is good for spray on truck beds, but I see no purpose in spraying it under a hot rod car on the floors. ??

Unless your constantly driving on gravel roads, doesn't make sense.

To protect against rusting you have to use a product that displaces water that gathers inside the doors and quarters.  Crown rust control developed by a DuPont chemicals engineer by accident is the answer.

mike 

[trbomax]

Bedliner wont seep into the cracks and pinch welds.Ive been undercoating my daily trucks and new trailers for about 40 years.First I kraft paper the floor.then run the vehicle up and useing a 3 gal pressure pot and a JGA gun with the largest orfice available,soak the underside,theninside doors and quarters,everywhere I can get with blackjack foundation coating cut 25% with enamel reducer.This stuff soaks in everywhere!Let it sit for a day or two with a box fan blowing under it.Repaper the floor and useing the blackjack without reducer,go over all the seams and joints.You will see this stuff seeping and dripping out of places you would never believe were there!Give it a couple more days with the fans,then I switch to a gel-coating gun on my pot and go over the whole truk again with penzoil under coating. The last vehicle I did this way was my 2000 superduty.With 190000 on the clock and 12 years of plowing there are NO rust holes anywhere,The bottoms of the doors are pretty bad,but not thru to the outside.
 On this truck I went so far as to strip the entire interior out and shoot the inside of the cab the same way.the floof pans are perfect on both sides 15 yrs later in the most severe rust belt in the world.

[madmike3434]

" the bottoms of the doors are pretty bad , but not thru to the outside" ..  That's what I am talking about, rustproofing the car on the inside of the doors.


If you look at the way the vehicle doors are constructed, water weep holes up about 3/4--1" above the lowest point, and that lowest part is where all the trouble starts because the water and moisture sit down in there and start the rusting process.    JUST LIKE THE FACTORY DESIGNED IT TOO !!!!   That's where the crown rust control system comes in with once a year treatment, where it coats the metal and displaces the water.

mike   

[trbomax]

 Tjhe black jack leaked thru almost all of the pinch at the bottom of the doors.There isnt any rust on the inside.They are rusting from the outside in,as in where the lower door gasket holds all the crap.cant do much about that except blast them periodically and refinish.

[chopper526]

The show (Carfix) claims they used it as a sound deadener. I imagine it is also more visually appealing for those who like to look, but it sounds like trbomax has the most effective process for rust prevention.

[trbomax]

The jeep guys use bedliner on both sides of the tub,but not the DIY stuff.My son had his done with the two part catalized kind after he epoxy primed every thing. Its held up great for 3 yrs nowHe did the jeep in pieces ,then assembled it.

 The way I do it is really messy and takes at least a week for the drying time between coats.Ill post some pics of the truck tomorrow,the only rust is the surface scabs and I'm going after them this winter.

[EDNY]

Just some food for thought, how about treating any rust with an encapsulating material, then spraying inside panels with non hardening rust proofing (ie sticky) and the outside with the hard bed liner.

[trbomax]

   Look ma,15 yrs old this month and no rust thru's or body/paint work ever done!I guess it almost qualifys as a "survivor"! We were thinking about tradeing it this spring and being that its a powerstroke /auto that has also never had a wrench on it except for a waterpump @ 120000 the dealer went nuts.I think he had it sold befor we left the lot!

[chopper526]

  Look ma,15 yrs old this month and no rust thru's or body/paint work ever done!I guess it almost qualifys as a "survivor"! We were thinking about tradeing it this spring and being that its a powerstroke /auto that has also never had a wrench on it except for a waterpump @ 120000 the dealer went nuts.I think he had it sold befor we left the lot!

I'll take it!!!!!!!!!!

[trbomax]

 I hear you! we decided to keep it because the old 7.3 is much less problimatic than the newer computerized diesel. It is also regarded as the best heavy hauler ford ever built and we need that for the trailer.