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Old 05-01-2013, 06:07 AM
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Do your best to never use a backing strip the exposed top edge will hold moisture like a cup and rot out the panel prematurely.,..yes ite easier but you know what they say about the ez route....
in spots like a rocker with no access simply use strong magnets to hold the new patch in place and flush...
most all your smaller seams will be butts. always flange the original panel never the patch .flanging the patch will leave the top of the seam exposed (like the weld strip) holding water and moisture...
if your patch has four sides that need welding,a you shouldnt flange all four sides ...flange the top and sides but the bottom needs to be butted to avoid the upside down flange that holds water....
never depend on seam sealer ...
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