Best place to get full undersealing, stone chip etc done

[dusty23]

As above really, does anyone know a good place in or around London to get the underside of the car fully cleaned out and re sealed, wax oiled or whatever the best method is for protection.

On a side note what is the method to get the best results.

Thanks

[Brianmoooore]

Whatever you do, don't let anyone near the underside of your car with bitumen based 'shultz' type underseal. This stuff is a time delayed death sentence for any car, since it promotes rapid rusting when it eventually dries out and begins to lift.
I have an E30 under restoration at the moment that was treated to this stuff, and removing it is the worst car restoration job I've ever attempted.
The original BMW underseal is an extremely high quality polyurethane type and should be largely intact, just needing repair in small areas, and adding to in places that weren't treated, such as around brackets.

[dusty23]

Thanks Brian. Is there potential for things like seams to be re-sealed? Once touched up with the BMW underseal will it need anything else. I have absolutely no knowledge on this subject, ive just heard things like stonechip and wax oil banded around a lot. Should have probably just googled it but will probably get a better answer here. Cheers

[rich318i]

bitumen drys out after like 10 yrs+ its an active paint (you have to get the good stuff). and anything that as polyurethane in the name is waterbased. id go for the oil based any day