HI....on my 54 the PO installed a later chevy metal bed floor. We are in the process of cleaning and welding the mess that was made by the PO. We are going to use a product called Hercu-liner on the floor of the bed only. Has anyone used this product and if so do youy like it? Also, what is the best type of caulking/sealant to use in any cracks which will be covered by the Hercu-liner application.....Thanks and T/C Steve