Using Bars Leak now in my 98 Cadilla Deville.
Instructions says to wait 1-hour, then drain.
I have to leave, what happens if I leave it in for more than an hour. WIll this clog
Why not ask them?
http://www.barsproducts.com/contact.htm
One more thing: You didn’t tell us exactly which product you want to use. They appear to have more than one radiator product.