I just purchased a 2009 L320 and have been spraying underside with waxoil..it just has surface rust but should I remove the plastic liners covering the outer sills to check and underseal?

Anyone interested in spraying underseal should read this from my post on Jag forum.

https://www.jaguarforums.com/forum/xk8-xkr...os-271397/ Always listen to old people or when they die you will live on in ignorance.
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Dont spend money on old cars you will never get it back

I would remove the rear wheel arch liners, and that short wheel arch protector behind the door, as lots of mud and sand can accumulate in there.

https://www.rrsport.co.uk/forum/topic45005.html?highlight=mud

Removed mine recently, surprised how much mud / sand was trapped especially the near side one. An easy job well worth the effort

Remove all liners and sill covers.
Clean
Treat any rust with a rust converter
Prime with a 2 part epoxy primer
Paint with a metal paint.
Lanoguard
Replace liners.
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Pistnbroke

I just got my 12 plate, I could not believe how much mud came out of the front when I took the bottom trim off.

It’s well worth the effort and get it out.

When I washed it the second time water now pours out of the drain holes behind the front cill 👍

HTH