Thanks guys for all the input...

I'm currently doing a 70 cuda, 68 charger, 69 dart and a 70 challenger... all vinyls all factory lead....all had either some rot or deep pitting underneath the lead... so although it's been in there for 30 plus years it did fail...

I've always re-done mine with lead but the reason I posted this was I heard a number of positive feedback comments on another forum about welding the seems shut (like resto rick said above), epoxying and using evercoats everglass then a light skim of rage on top and you're done... no moisture problems as the everglass on the bottom is waterproof, no acid trap to worry about with lead.... Anyone used it before? here's a link: http://www.evercoat.com/productDetail.aspx?pID=36