I agree with RichD on his points. I have extensive experience in designing decals over my 35+ year career as an Art Director, Graphic designer and typographer. I'll further add that when designing decals in your drawing program here are some of my tips.
Thompson's Tips :D for Inkjet on both white and clear Bel decal papers
- Drawing all your art as vector line art. This will be tough for most, but to not get a 'fuzzy' rastered look is the only way.
- Make your colors, 'rich'. For a dark blue add black and more magenta to it. A solid 'rich' black (I use Adobe Illustrator), specify it as 100% Cyan, 100% Magenta, 100% Yellow, 100% Black. By richening up your colors, the possibility to have bleed through from a background color is reduced.
Printing on white- Use a super thin hairline 0.1pt or 0.02mm of black for outlining roundels to trim later
Saving files to print (this is the most important)
- In Adobe Illustrator, select File > Export… and set to 600dpi .png file.
Then open this up in Adobe photoshop and print on your inkjet.
Printer settings- Check to make sure you set your printer output to the highest quality, use photo paper setting and at the minimum 600dpi. Higher resolution is better. However, all the La Carrera Panamericana small rallye plate decals are only printed at 600dpi and I think they can stand up next to any industry level for detail.
Coating inkjet printed decals- I use Bel Decal paper and use the recommended Krylon crystal clear acrylic spray. The key with this is to lay down three good mist coats of Krylon and let dry—in-between each coat—at least 12-24 hours before spraying the next. Don't make each a wet coat.
There are many other little graphic tricks and nuances I use to make each design really look the part, this comes with experience. Creating custom livery decals is my specialty if you have good ref. photographs to start with. I specialize in typography and making it replicate exactly as the original. Remember, most race cars back then had hand painted lettering and graphics, which makes it even more difficult to match.
Here is an example of some of my recent designs, this is the set for Audi1's entry into the La Carrera Panamericana race.
NOTE: these have been printed using a printer that can print white and do not require you hand trim the roundels. These have a traditional style light blue backing, but are wax based and are a little 'stiffer' than an inkjet decal, requiring Microsol to help lay down. This is the same printer we used for the RSR IROCs.
Happy to help. Cheers, Thompson
