Recomend me some underbody sealant

[JagRigger]

Having run over a tree stump over the winter, today saw me beating the nearside rear floor-pan back to shape.

As a result, I need to touch up the 'underseal'

Can you buy anything close to the original spec ?

[Critch]

Primer and Wax oyl to make sure it fully sealed

[Ben50n]

House gloss paint, it is more durable against stone chips being oil based!

[Big Dave]

Primer and Wax oyl to make sure it fully sealed

Waxoyl isn't any good in high impact areas such as wheel arches. It's main use is for cavities and box sections, such as door panels and sills. What it is handy for though is to rejuvinate old underseal that has gone hard and started cracking. It will soften it up again.

What you really need for the underside of the car is something like Tetroseal underseal. A bitumin based product that absorbs stone impacts and resists water.