Hi Shaun
I am split about 50%/50% signs & tinting.
I do cars and archetectural flat glass.
While it is possible to teach yourself tinting it would take an awful long time and there are so many little tricks of the trade for car tinting it is well worth doing a course. It then takes plenty of practise on many cars to get proficient and be at an acceptable standard to charge customers for your work. The basics are easy and that what leads many into thinking its an easy job to get into. In real life its very frustrating with so many things that can go wrong during the many stages of getting a tint onto a car without dust. Its not a quick buck. So many one man bands start up and charge ridiculously cheap prices because the material and tools are relatively cheap but forget to charge for the skill in doing a good job and the hours of practise to get there. These cheap shops usually only last a few months then move on. I started mainly on car tinting but unless you are based in a city with a high turnover and do it full time it is not a big money spinner/.
I’ve been doing it now 10 years and in that time it is the only part of my business where I have not raised my prices at all yet seen rent and materials prices rise constantly. I now still do cars when asked but really not that bothered with it as the other parts of my business are far less stressful and pay better.
As for Archetectural tinting. This is where the money is and although the fitting may be more straightforward than a car training is still advised. Most Film supply companies will organise training on their films as the important thing is to use the right film in th right place. Only training can teach you this and the potential to muck it up and cause alot of damage is high.
As for tools, you would learn what you need on a course as otherwise evrybody has their favourites.