This is a must for properly sealing the glass into the windshield frame. Unlike the local glass shop types, ours is a special "all rubber" formula designed to look and perform like the original Ford factory type. It creates a water tight bond as it cushions the glass. Just fold tape over the glass edge and insert glass into the frame. Excess is easily trimmed with knife.
To determine the thickness you need, measure the width of glass, then the width of the channel that glass fits into. Subtract the width of glass from the width of channel and divide this figure by two. This will be tape thickness. For best results, the tape should be slightly larger than the gap. Tape comes in 20' rolls. All sizes are 1.5" wide.