'Traditional' Dinitrol Underseal verus Full Cavity Treatment

[AndrewEH1]

I'm having a car imported (Subaru Forester STI), the car will most likely live outside.

The importer offers a traditional Dinitrol underseal treatment as part of the total cost but for an additional £180 (inc VAT) they also offer what they call a "full cavity treatment"

This additional treatment "is applied through a high powered lance into the box sections, door shuts and bonnet skins, it will basically go anywhere we have access as well as it having a creeping agent to enable it to continue coating the areas until it sets"

The additional £180 cost is negligible in terms of the total cost of getting this car on the road.

Are there any potential pit falls of having this treatment done?

TIA

[J4CKO]

Tell them to do nothing, save the cash, research it, get it home, get a cheap compressor and the Dinotrol and do it yourself and spend some time on it, then you know for sure its as well covered as it can be.

The extra £180 just sounds like, takes some more cash, spend another ten minutes on it to me.

[AndrewEH1]

Although the idea of doing it myself might be appealing, I live in the city so lifting the car to get good access is basically a non-starter.

[227bhp]

No pitfalls.

[Belle427]

It can be a very messy job so sometimes its best left to someone else, but how good a job are they likely to do is my only worry.