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if it's a place like the backs of the flares you can spray your E-primers on them not a big deal to do .
if your dealing with inner boxed type areas that you have little to no access to you have to rely on the weld primers to do there job .
in many cases you can still get a protective coating in a boxed area thru a drain hole or what ever access you can find .
i will when i can spray rust shield or e-primer in the areas to just get some more coverage over the welded seams . i use a old chip guard gun with a extra long thin wand i made up out of plastic tubing for doing so .
the thing is with a weld zinc primer the zinc doesn't have to coat every thing to work . it's best when it does but it's not a must .
it's the same as placing a piece of zinc on the metal rudder of a boat . the little piece of zinc protects the hole rudder even though it only is one little spot .
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