I have been MOT testing for over 15 years and have seen many vehicles with the shutz type product applied. i often see them a year later ( next mot) and am shocked how little the think black goo has done to stop corrosion or protect against it. The dinitrol product ( which is much more expensive) lasts/works so much better.
Underbody shutz product is widely used within the trade and often used to cover lots of nasties - its very cost effective too as it covers well. Its just not as good as other products at doing the job. its often sprayed over surface rust which it doesn't cure - just peels off a few months later as the rust continues its work. Dinitrol doesn't seem to peel off. I don't sell the stuff - just spend my days looking at the underside of vehicles.
If you want the best protection for your car you'd be best off avoiding shutz IMO. You get what you pay for.
PS. I think the Morgan factory use Dinitrol on new cars for protection.
Last edited by andymot; 15/03/17 12:04 AM.
