I cleaned down the entire underside of my '64 and was pleasantly reassured that everything was in good condition. As I planned to use the car very regularly in typical Irish weather I wanted to ensure it remained good.
Once cleaned I applied the underseal in three coats, leaving 24hrs between each. I then bought Waxoyl in both Aerosol and Injector form and used it liberally everywhere I could find. I didn't drill any holes, I was reluctant to do so, but I feel there may be something further I should do. Is there a way that is generally accepted as the best thing to do, i.e are there factory holes I should spray into ?
Regards,
Ben in Ireland.
'64 230SL 4sp.