Under body paint

[Johno]

I'm just about to start painting my car with cellulose on the outside, to keep things safe. Any recommendations for products on the underside?

[Badwolf]

I think Dinitrol 4941 under-body wax gets good write ups. I have not tried it myself but will get a can when my paintwork is done to try. Bilthamber also do a similar product. I think that you can get the Dinitrol in aerosols.

[Clive]

I used etch primer on bare metal, then 2k primer and black. However, to avoid 2k paint a decent primer, and I have used chassis black paint on another car. Sold by a proper commercial supplier on eBay, high zinc, nice stuff to use and seems a quality product. About £30 for 2 1/2L of the stuff. 

And yes, I have used the dinitrol wax over the top right in danger areas. Really tough, 5 years, 20kplus miles in all weathers and still protecting the wheel arches which get a battering on high speed motorway journeys in the rain...

[Badwolf]

Johno - If you are painting your car in an area where silicone products have been used (lubricants, sealers etc), you might want to add some upol anti fisheye additive to your paint just in case of any airborne contaminants.

https://www.u-pol.com/us/en/product/system-20/coatings/paint-ancillaries/fisheye-eliminator-anti-silicone-additive#.X1YZ13TTVxA

Available from the usual suspects.

[Johno]

Thanks guys, johno