The white under seal

[drakesmith]

Ok. Taken the black away and has a white coat under it..

What is this?

Cheers

[aze30]

Some sort of rubber sealer for under body protection that Bmw use ....extremely good stuff and difficult to get a product similar quality to replace ...a˜”

[aze30]

Some sort of rubber sealer for under body protection that Bmw use ....extremely good stuff and difficult to get a product similar quality to replace ...a˜”

[Scotty200]

Sorry to jump in on this thread, I am also after s product to match the white rubber sealer, I’ve done some repairs to my rear valance/ boot pocket any ideas on products to use or match in would be great
Thanks scott

[Brianmoooore]

AFAIK, there's nothing other than primer under the majority of the polyurethane underseal used on E30s. Any seams and joints will have seam sealer brushed into them, which could be described as a white rubbery substance. Seam sealer is readily available from any motor or paint factors.

[barntuning]

The product your looking for is 3M 08800, its a 2 part sealer that needs a special gun to spray on.
I purchased mine from: www.spraygunsdirect.co.uk
To cover total underbody of e30 took 17 bags (250ml), and not cheap.
It took a month of weekends to remove old sealer with a heat gun.
3m sealer looks and feels like original, when set, paint same colour as car. Bobs your uncle

[Brianmoooore]

The product your looking for is 3M 08800, its a 2 part sealer that needs a special gun to spray on.

That's the black (or grey) coat. OP was asking about a white substance underneath.