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For the car gurus - underseal

Forget about any of the rubberised treatments. Years back I witnessed the full rebuild of a Honda CRX and the underside was treated with Por15 from Frost. Astonishing stuff, dries rock hard and doesn’t absorb moisture. This was a 1985 Japanese car that was still rock solid underneath when it was sold around three years ago!
Please note, the shell had been kept in a warm dry garage before application!

Just stay clear of the rubberised stuff!


 
Yes, the traditional black rubberized underseals have always had this reputation. I've not seen anything that nasty for a long time though. I'll stick to the Waxoyl. My other favourite is slathering brake pipes in grease. MoT testers hate it, makes the pipes harder to inspect. I do it to slow down corrosion, steel brake pipes for our 12-15 years in and repairs are around £300. A tub of grease is dirt cheap. It stops corrosion dead and the unions will never seize.
 
Many years ago, there was a very well-known anti-rust treatment that was applied to your new car for a suitable sum. So well-known I've quite forgotten what it was called...Anyway, a bloke at work bought a new Escort 1300E that he had treated with this stuff, and within three years rust was blossoming through on top of both front wings.

I always used Waxoyl, which provided you topped it up regularly, worked well. I've still got an ancient tin, must be over fifty years old, lurking in the garage & occasionally dip into it to coat things that are going to sit outside. I did try it on a pair of supposedly waterproof fabric boots & it certainly worked well, but it stank the place out.
 
I've always used Waxoyl, warmed to a warm room temperature and sprayed on using a schultz gun. So far it hasn't let me down, I had the Dino's chassis done when it was rebuilt in the mid 80s and it's still rust free
 
I've always used Waxoyl, warmed to a warm room temperature and sprayed on using a schultz gun. So far it hasn't let me down, I had the Dino's chassis done when it was rebuilt in the mid 80s and it's still rust free
Which Dino?
 
I've always used Waxoyl, warmed to a warm room temperature and sprayed on using a schultz gun. So far it hasn't let me down, I had the Dino's chassis done when it was rebuilt in the mid 80s and it's still rust free
Wow, that's some recommendation.
 
To add to Dinovector's post, I used to place the can of Waxoyl in very, very hot water for 20 minutes prior to use and then take it out to the car in the bucket of hot water. I have even been known to add to the, by then warm water, with more water from the kettle. That method worked even when it was very cold outside.
 
Many years ago, there was a very well-known anti-rust treatment that was applied to your new car for a suitable sum. So well-known I've quite forgotten what it was called...Anyway, a bloke at work bought a new Escort 1300E that he had treated with this stuff, and within three years rust was blossoming through on top of both front wings.
Ziebart, Dinitrol, Protectol were the brands of the time. Escort wings, aah. Takes me back. The insides were only in primer I think. Perhaps some sort of black crud on top. No wheelarch liners though so the infamous mud poultice always formed. Rotting inside 3 years, you forget. I remember my dad bought a 1976 Mini, by 83 it needed repair to the sill, when we cut off the rusty one we found the remains of the old one underneath. 7 years old, rusted through twice. They don't make them like they used to. No, and thank Christ.
 
To add to Dinovector's post, I used to place the can of Waxoyl in very, very hot water for 20 minutes prior to use and then take it out to the car in the bucket of hot water. I have even been known to add to the, by then warm water, with more water from the kettle. That method worked even when it was very cold outside.
Easier is to thin it with paraffin or white spirit IME. It's important with Waxoyl and similar to let it dry. I once carefully sprayed the underside of a Mini, got everything thoroughly coated. Great. Then my dad took it to town immediately, it was chucking it down. On return, no wax. Once dry you can power hose it, but when it's still soft and wet any water will remove it.
 
Agree about letting it dry but one of the good things about Waxoyl is it never really dries completely which is why it stays flexible. Another advantage of using warm Waxoyl when the car is cold is that it stays put and doesn’t drip down vertical surfaces quite so much. I sprayed it into the heater channels on my Beetle about 30+ years ago and on the rare occasions I use it now and if the heaters are turned on full you might still get the odd wiff of Waxoyl.
 
Ziebart, Dinitrol, Protectol were the brands of the time. Escort wings, aah. Takes me back. The insides were only in primer I think. Perhaps some sort of black crud on top. No wheelarch liners though so the infamous mud poultice always formed. Rotting inside 3 years, you forget. I remember my dad bought a 1976 Mini, by 83 it needed repair to the sill, when we cut off the rusty one we found the remains of the old one underneath. 7 years old, rusted through twice. They don't make them like they used to. No, and thank Christ.
Well done Steve! 'Twas Ziebart. A big thing back then, but then we didn't have the internet to browse through for anything negative; mostly relied on the advertising.
 
I'm planning to use Lanogaurd on my Vitesse as soon as it gets warm enough. I'll use Bilt Hamber Dynax UB in a couple of especially rust-prone areas, but it's pretty messy stuff.
I used POR15 paint on the underside of my beach buggy when I built it - it cures as "hard as a hoor's heart" and after 10 years there were no signs of rust anywhere.
 
Many years ago, there was a very well-known anti-rust treatment that was applied to your new car for a suitable sum. So well-known I've quite forgotten what it was called...Anyway, a bloke at work bought a new Escort 1300E that he had treated with this stuff, and within three years rust was blossoming through on top of both front wings.

3 years was pretty good for a mk1 Escort, my father's car rotted through the tops of the front wings in 18 months!
 
Wow! I bet you did alright out of that. 246 prices have risen incredibly.
Considering the way I've chucked money around all my life yes, it was probably the best move I ever made buying it despite it costing a fortune to maintain over the years including 2 full engine rebuilds, then that was money I'd have probably wasted on the next toy that devalued within a week
 
Easier is to thin it with paraffin or white spirit IME. It's important with Waxoyl and similar to let it dry. I once carefully sprayed the underside of a Mini, got everything thoroughly coated. Great. Then my dad took it to town immediately, it was chucking it down. On return, no wax. Once dry you can power hose it, but when it's still soft and wet any water will remove it.
True, I just don't like how runny it can get if you add just a little too much, however where there are seams and the like it is streets ahead soaking into tight spaces and cracks
 
Cheers for the input folks

I'm going to go with Bilt Hamber Dynax UC for the inner wheel wells & arches: https://www.bilthamber.com/corrosion-protection-and-rust-treatments/dynax-uc

I'm going to go for the Dynax S50 for the sills: https://www.bilthamber.com/corrosion-protection-and-rust-treatments/dynax-s50

I'm going to get the Lanoguard kit for the suspension; rear subframe & diff and for some of the underbody panels

As said; really want to avoid using the black products if I can; so those 2 tick the boxes I'm after :) As the cars already no rust; this is a preventative measure that I want to do for now and if/when I sell it; the next owner can decide how far they want to take it, if at all
 


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