Ive always worked at top notch bodyshops (well there shit holes,but on paper were ment to be the bollocks)

And 99% of them,give a lifetime guarente on all work..So if you have a new panel on,and it starts to rust again,or paint bubbles/defect youve coverd...

Thing is,if your having arches put in,because of rot?? If it comes back,then you might not have a leg to stand on,as its a modification to an existing panel,NOT a new panel...So best to see what they say before you go ahead with it...

Pete...