Looking for advice on oil based undercoating/rust prevention

ddicosmo

ddicosmo

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I have a 2008 SR5 that is starting to exhibit quite a bit of rust underneath. The rust still appears to be surface rust (from what I can tell) and has not penetrated through (yet). Since I live in the Northeast snowbelt (NH), I'm looking to at least stop the rust or possibly prevent any new rust from forming or getting worse. There is a place in Concord NH that does oil based undercoating (https://nhoilundercoating.com/). Has anyone done this to their 4runner (or other vehicle) and if so, how has it worked out? Are there other (possibly better) options? I'm looking to so this ASAP as winter is fast approaching. Any advice would be greatly appreciated. Thanks,

Dave.
 
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It looks like the same concept as with Fluid Film and Krown, just different product used. Most require touch up or rep-spray ever year. See how long they suggest their oil based product will last?

Eric with South Main Auto has a couple videos showing the process with his Tundra on the youtube.

I would investigate and ask some good questions with the owner/operator. See how they treat you and how knowledgeable they sound to be.
 
Yes, it is similar to Fluid Film. I also thought of possibly trying Fluid Film as well but I don't have a lift so I can't apply it myself. This place recommends a maintenance plan with this product (once every year). I'm just wondering if it is worth it or not. I'd like to hear from people who have had this done or used Fluid Film. Is it worth it or am I just wasting my time and money trying to keep up with and delay the toyota rust issues? I would like to keep my 4runner for as long as I can (85,000 on the clock) but by the looks of it, the body will rust out before the engine quits...
 
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My personal opinion would be to treat the rust first, and then top that with the oil based protection. By treating I mean POR 15, or the Eastwood rust encapsulator.
 
I have used Fluid Film for a couple years and gave up as I am not happy with the results. Seems that after a few car washes most of it is gone. Did the POR15 right after I bought it and removed as much rust as possible then did the cleaning and pre-treating as directed. You can't get all the rust off and after a year or 2 the rust expandedunder the POR15 and the finish started flaking off.
 
I've had good success with CorrosionX on other vehicles, so that's what I'm using on the new-to-me '07 T4R. Experience says it won't stay on if it's in the wind, but for areas that aren't exposed to high-speed air (or the stuff that contains) it should work great. My favorite part about it is the way it creeps across the metal over time; means you don't have to do a great job at getting it everywhere, just nearby is enough.
 
feralcomprehension said:
I've had good success with CorrosionX on other vehicles, so that's what I'm using on the new-to-me '07 T4R. Experience says it won't stay on if it's in the wind, but for areas that aren't exposed to high-speed air (or the stuff that contains) it should work great. My favorite part about it is the way it creeps across the metal over time; means you don't have to do a great job at getting it everywhere, just nearby is enough.
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How are you using it for vehicle application? Just spraying it on once a year? Or are you working it into already rusted parts with a toothbrush?
 
I have read about using boiled linseed oil, its old school but from what Im reading it seems to have worked for rust proofing. I sprayed it with a touch of oil based black paint and used a paint gun with low pressure as to somewhat control overspray. It took 3 to 5 days to dry and it stinks during the curing time but hey it's worth a shot as it is cheap.
 
UURunner said:
How are you using it for vehicle application? Just spraying it on once a year? Or are you working it into already rusted parts with a toothbrush?
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Depends on the area of the car, tbh, and I also buy the CX by the gallon and not in the spray can.

Threaded fasteners (heads or shafts) I use a small brush.

Body seams I use a 1" paint brush.

Larger areas/inside the frame I mix it with mineral spirits and spray it with a ZEP hand sprayer from the depot; may push it around with the paintbrush if needed.
 
Old thread. I bought a gallon of Blaster surface sheild. Stuf is crap. After spraying on the underside of my 4runner it dripped continuously for months and one year later the rust is completely dry and active again. I had used NHOU and really liked the results. It never dripped and coats well.

I bought this $25 air sprayer from ebay and it did really well. Best to do it outside and wear a mask. There is no moving parts to fail so it should last years. And it had no problems spraying the thick NHOU fluid using the biggest orifice 3mm. Buy it by the gallon, its more economical.



MAXXT paint sprayer
 

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I’ve been very happy with fluid film. I’ve got a guy in Woodbury, CT that does it for me. First time coating is a bit more expensive but they do a very thorough coating low viscosity to get inside all the nooks and crannies then he also does a thick high viscosity coating for a great combo of coverage. I bought my car in California and I’ve had it out here in NY for 2 years and it looks just as good as the day I bought it.

Here’s a pic:
1w3XpNu.jpg
 
Syr4RinNC said:
I bought this paint sprayer (used) and it struggles with fluid film - gets gummed up several times during use
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Try drilling out the orifice to let more product out. Mine is 3mm. And seems to work well. I also found that running it up on ramps helped get a good angle at the frame. Did ramps on each side to tip the truck away.
 
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I'm in the process of doing this now. Just completed one 4runner and now I'm doing the other. It's not a bad job and you will save yourself some money if it's a DIY. A drill, wire wheels, some abrasive 3M roloc discs and red scotchbrite pads should be all you need for prep. Clean as much of the rust off as possible. I'm using Corroseal to put over the frame to seal everything and kill the rust. Then spray the frame with the protectant ( I'm using surface shield), Home depot is the cheapest I've found.

It is too late for the red 4runners frame. Too many rot spots. Just trying to get through the winter and in the spring I'll be putting another frame under it.
 
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