I agree, however, businesses in the practice of manufacturing are exempt from the tax. SO my question is, are 
sign companies considered to be manufacturers?
		
 
Think about it for a second.  Do you really 
MANUFACTURE anything ??
You make 
signs.  Do you cut the trees, mold the plastics, create ink from scratch or anything else ??  Do you extrude the aluminum ??  Do you fabricate the banner material ??  Do you have vinyl vats out back from which you manufacture your own vinyl sheeting ??
NO.  You just make 
signs by buying already manufactured goods and you put them together to make a pretty 
sign.  That's not considered manufacturing unless you're doing them on an assembly line for hundreds or thousands  of customers at a time.
- Is your business located in a manufacturing zone in your town ??
- Is it located in light industry ??
- Is it located in Commercial ??
If not one or both of the first two, again, you're not a manufacturer.
Are you set up for manufacturing license-wise or anything else other than a 
sign shop.  Sure, we can use the term that we fabricate 
signs or even stretch it and say we manufacture 
signs, but I highly doubt.... if you have to ask this question you really qualify.  Sounds more like tax evasion.
Our shop is in a industry/manufacturing zone, so we might be able to stretch it for what you're asking, but we don't.