ForceyBoy said:

Thanks for the above - so when you protect the underneath of the 90, do you cover it everywhere? Obviously not the engine/wheels - but the axles, bottom of the cabin, footwells etc?

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Basically yes. Avoid the brakes and exhaust and try and get it into all nooks and crannies. Some kind of injector lance would be good to get inside cavities as much as possible. Inside door posts and bulkhead and obviously chassis are important. If your door frames are in good order, drill a hole and get it into there until it runs out the bottom, but ensure you don’t block the bottom drain holes.