Mark Fit is a special solvent designed to soften your model decals which will allow you to apply them onto difficult to apply areas such as bumpy and curved surfaces. This strong version has a more powerful formula for softening decals compared to the standard version. The Strong version help decals adhere and conform to difficult curved surfaces or matte-painted surfaces. In addition, it could also help speed up the decal application process. The Bottle cap comes with brush applicator and contains 40ml of solvent.