I used 751 on a dimpled garbage can, heated with a torch (heat gun will work) after applied. It is holding up fine after 1 year. Just prep well, maybe heat surface before also. A felt squeegee is also a good idea.
A round brush works really well for this, actually. They sell them at the local supply house here just for doing that sort of thing - the vehicle wrap people use them to get the graphic tight around rivets, screw-heads, whatever. The brushes are round & come in different sizes with the bristles all the same length so it creates a flat, round surface. You just kind of dab at the surface with the tip of the brush and it pushes the vinyl into the contours.
A round brush works really well for this, actually. They sell them at the local supply house here just for doing that sort of thing - the vehicle wrap people use them to get the graphic tight around rivets, screw-heads, whatever. The brushes are round & come in different sizes with the bristles all the same length so it creates a flat, round surface. You just kind of dab at the surface with the tip of the brush and it pushes the vinyl into the contours.
yes the most important part is like lost1 said.. to flame or heat treat the surface before applying..
also after you heat treat it.. wipe it with alcahol.. and apply the vinyl withing 10 -15 mins of the flame treatment.
hey, if your worried about the heat you might try a hair dryer, also use a rivet brush and this will help sink the vinyl into the texture. the most important part to have down really well of course is the edges.
Vinyl application on Coolers? 
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