Vintage-and-Classic
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Fair point but it also brings this topic into context: What's a proper job? This is a thread about "undersealing" and tbh "a proper job with underseal" is an oxymoron. Shutz is ok in small areas to protect against abrasion or impact but only if it is applied over the top of a proper job. Brush on underseal is porous, doesn't protect against rust and is usually used to hide a shed load of rubbish underneath.Whatever you do don't think even a good job will stop your vehicle rusting, it only slows it down.
When it eventually does need welding it makes it a proper ball ache of a job.
Waxoyl / Dinitrol over the top of a chassis is also not a "proper job" but is a cost effective preventative if approached as described by jamesmartin. In my mind a "proper job" is this: cut out rusted areas and butt weld in new metal as required - for an older Landy this usually means at least a new rear cross member with extensions and new outriggers. Then bare metal the whole chassis and treat with trade quality rust treatment. Then prime with a sacrificial primer. Then top coat with synthetic or 2 pack paint. Following this treat the inside of the chassis with rust preventative followed by Dinitrol. This is to my mind a "proper job" but it will still need to by maintained on a yearly basis by making good any abraded or chipped areas to the same standard.
You are quite right that this only slows things down... but it slows it down by a hell of a lot - a properly maintained chassis should last for decades and since I don't own a modern car then this is what I have to aim for in the interests of daily use.
When you need to weld a chassis which has been treated like this simply sand away the paint with a disc in an angle grinder. Any areas of corrosion will be very small if you catch them in time and preparation will be less time consuming than tackling a rusty flaky untreated chassis.
nobber said:You could also ask for the moon on a stick.
For the price mentioned by the OP you might as well ask for all 62 known moons of Jupiter on sticks.