Undercoating

[Industrial Toys]

I didn't do my 08 GMC from new but did Krown every year about three years in.
after
Not sure if it helps or not. I'm kind of wondering if it is too environmentally friendly to do any good. It seems to wash off way too easy.

 

[shooterdon]

I have an aluminum F150 and still had Krown treat the undercarriage to protect the frame

 

[coobie]

I didn't do my 08 GMC from new but did Krown every year about three years in.
after
Not sure if it helps or not. I'm kind of wondering if it is too environmentally friendly to do any good. It seems to wash off way too easy.

My 2016 truck has Krown it seems to stick pretty well.Had the 3rd treatment done last week..

 

[sld]

That rust converter in a spray can in junk. I scalled/wire cup brushed my yukon frame 2 yrs ago. Sprayed it with that. I found 2 holes in the frame this year. Tour better off with just primer and paint than that stuff.

Hmm. I have had great results with that stuff. As with any paint, you really have to clean the area to be painted with a good solvent and lint free rag. Maybe your prep work is lacking?

 

[crazyal]

I would think getting inside a boxed frame would be a problem without a special wand to reach inside it. Even with all the factory holes it would be blind luck to cover every spot.

 

[Billself]

I've done a lot of things to prevent rust on underside of pickups living in WV the roads are ruff and really bad in winter so I've use every thing from rust bullitt to POR15 I've used bed liner with a good bedliner gun (not spray can) and all i can tell you is that do what your wallet allows if your wanting to go down to bare metal really clean frame and under bed,cab,etc then POR15 then a light top coat because its not UV protected,then thats the stuff for you if don't want to clean to bare metal and still clean with wire wheel on grinder trying to get the best you can without killing your self then rust bullitt is great stuff , its really tuff stuff won't let any thing get under it sticks great and cant get it off after cured ( but best if sprayed with a gun, not brush or roller) if your not into all the time and money i suggest bedliner (not spray can) use a good sprayer they sell them at eastwood and there cheap comes with wonds and different tubes for diff. applications used them many times because people cant afford to pay me to take it down to bare steel and prep,paint and protect there frame. so i use alot of the bed liner and seems to work great if it chips or flakes just spray it again. Its all on what you can afford . stay away from all the things that said just minutes and you can be protected from rust, that stuff dont last or work as discribed ... just my two cents good luck

 

[Industrial Toys]

I had my 08 GMC Krowned a few weeks ago. I left it parked on a coloured concrete apron last week and there were drips. I thought I would get some industrial cleaner and pressure wash the spots.

Then we had some rain and the spots are GONE! I am now very suspicious of what that environmentally friendly stuff is good for? I'm sure there is plenty of science involved, but something that washes away in the rain?

Maybe it insures necessary ongoing applications as well.

 

[coobie]

I had my 08 GMC Krowned a few weeks ago. I left it parked on a coloured concrete apron last week and there were drips. I thought I would get some industrial cleaner and pressure wash the spots.

Then we had some rain and the spots are GONE! I am now very suspicious of what that environmentally friendly stuff is good for? I'm sure there is plenty of science involved, but something that washes away in the rain?

Maybe it insures necessary ongoing applications as well.

How long have you owned the 08 GMC?Any problems with rust?

 

[Industrial Toys]

Bought it when GM went Belly up, free 6.6! Frame was rusted from the get go. Rear fenders have paint flaking off and also under doors. Starting to rust. Not major, but the question is what to do. Body work would be throwing money away!

 

[SpringHollow]

My trucks used to get extremely rusty underneath in only 3 or so years - they are parked outside on gravel. They were so bad that my mechanic would tell us to trade them in while we could. I started having our vehicles Ziebarted a while ago for the undercoating and it really has worked well. The oldest vehicle I have right now is on its 8th year and no visible rust. We do the annual free inspections. Admittedly, Ziebart is a pain because they pressure you for 15 - 20 minutes each time, trying to get you to buy extra services. For me, rustproofing is much less necessary vs undercoating.

Ken