Yes, you can use the custom font for your signage. We need to know the fonts name, which we can download the fonts file base the fonts name, if it is not a free font, please order it at first then send the fonts file to us.
Before you order the fonts, we suggest you contacting with us at first, for not every font fit to build the signage. For example, if you need to order a LED illuminated signage, we need the Min. width of the strokes reach 12mm (0.5"), so that we can place the LED lighting in the signage shell. But if you choose a font with very thin strokes would make it is impossible to make your signage as the LED light signage.