The sealer has now been applied to the front area on our 65 K code Mustang convertible. We are very pleased with the results.
We used 3M™ Ultrapro™ Sprayable Seam Sealer. It is 3M™ part number 8374. This sealer is only available in a gray color, but we chose to use it not only because of its texture, but also due to its great durability. It provides great adhesion. After the splash shields, outer shock tower covers and other parts were installed, the area was prepared by sanding and cleaning.
The sprayable seam sealer must be applied with the special spray gun which is also available from 3M™. This seam sealer can and should be top coated, so after drying, we applied 3M™ No Cleanup Waterbased Undercoating. This is also used with a spray gun. You don't use the special spray gun like the one for the sealer, but it is not an aerosol. We chose this product after spraying test panels to achieve the "look" and texture that we thought best duplicated the original sealer. Since durability and quality are also very important goals in our Mustang restorations, we have done our own little tests in this area too. We have found that this product holds up extremely well.
Keep in mind that different spray patterns were used on the Mustangs between the various plants. For example, most San Jose produced Mustangs will not have the sealer sprayed over the outer shock tower covers. They were installed later after the sealer was applied.
The 289 High Performance Mustang here is an August 1964 production Dearborn produced car.
As always, thanks to Jeremy Turner at Maple Hill Restoration for supplying all of the technical information, doing the research, and performing the beautiful work on this Mustang.