Thanks for the info, I will buy some come summer and grease the crap out of the rears when I re do everything.
What causes rust in some P5s but not others?
- Thread starter cutchemist
- Start date
Thanks for the info, I will buy some come summer and grease the crap out of the rears when I re do everything.
I had a problem with the factory undercoating. It dries like paint and the water eventually gets underneath it and creeps along hidden and unnoticed. I spent two days last summer scraping that stuff off. I would start where I could see rust and it had crept under up to 4 inches away.
Perhaps the 3M stuff is different and stays a little bit oily.
Installshield 2
Gothenburg Superiority
^^well factory undercoating is never meant to be permanent, its to last as long as the warranty...which is all that matters to Mazda...So scraping it off is not a bad idea after 10+ years...I was just point out that this stuff dries and appears to be very similar to whatever was used from the factory...meaning...it should last an additional 3 years without needing touched up...
its not just that...but mazda's application of undercoating is kind of weird...They seemed to just skip certain seams, leaving major areas of each well just bare metal...hitting those with this 3m stuff and fully coating each entire wheel well...is probably about as good as we're going to get...
its not just that...but mazda's application of undercoating is kind of weird...They seemed to just skip certain seams, leaving major areas of each well just bare metal...hitting those with this 3m stuff and fully coating each entire wheel well...is probably about as good as we're going to get...
Pre-Planned Obsolescence
Time 4 a new car
I agree with u.
I'd hate to see what my tin can would look like if there was no factory undercoating.
I only scraped off the french pastry stuff.
I'm pretty sure the original owner never sprayed it.
I recommend everybody start spraying their car from new.
I sure as hell would if I could afford a new car.
Time 4 a new car
I agree with u.
I'd hate to see what my tin can would look like if there was no factory undercoating.
I only scraped off the french pastry stuff.
I'm pretty sure the original owner never sprayed it.
I recommend everybody start spraying their car from new.
I sure as hell would if I could afford a new car.
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I'm gettin a new toy tomorrow,... multi-meters are on sale at Canadian Tire,... I can afford the high end version,... auto power off,... no dead batteries,... like every car should be. $23.99
OOps I'm hi jacking again ignore this.
Maybe it's OK the OP is Canadian EH he lives in winterpeg. Every good mechanic needs this tool. The guy I sold my code reader to said his mechanic doesn't even have one,.... It's tough out here in the woods.
Say Hello To my Little Friend:
OOps I'm hi jacking again ignore this.
Maybe it's OK the OP is Canadian EH he lives in winterpeg. Every good mechanic needs this tool. The guy I sold my code reader to said his mechanic doesn't even have one,.... It's tough out here in the woods.
Say Hello To my Little Friend:
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easy fix
to
How you do that? By doing what everyone has been suggesting on this thread? My rust is starting to spread and its making me sad. I haven't even checked under the side skirts either! :/
cutchemist
Member
Any recommendations for a proper cleaning of the area before applying grease?
cutchemist
Member
Also, is the M grade/coating spray being suggested?
http://3mauto.com/products/adhesive...onal-grade-rubberized-undercoating-03584.html
http://3mauto.com/products/adhesive...onal-grade-rubberized-undercoating-03584.html
Installshield 2
Gothenburg Superiority
^^this is exactly what i was talking about earlier in the thread. I used it on my front wheel well, pretty cool stuff...
I would just wash it good with your basic garden hose to get the salt and dirt off. Make sure it's dry, you don't wanna seal in moisture. I would only pick off the really loose flaky rust.
This is pretty much just my opinion but I think scraping too much rust off is a bad thing, especially if the bare metal is exposed. I think a thin layer of rust gives the grease something to cling to and creates a thicker better adhered coating. I picture grease on smooth bare metal or painted surface and figure it could run off or be rubbed off much easier. The rust itself is actually the first barrier for the bare metal underneath, but instead of it holding moisture up against the metal, you get it to hold grease there instead.
I have used a thin oil first (like liquid wrench or any spray oil) to soak through the rust and get to the bare metal, but if you spray too much, the grease doesn't stick and then it's hard to get on there. Grease does have some tendency to liquefy and therefore creep through the rust to the bare metal, but I like to try to make sure it's saturated with the spray oil first. Perhaps waiting a few days after the oil spray then wiping off the heavy oil for the grease to stick better.
