I'm not sure how many of the DiY crowd at AVS has really had a chance to compare, in a properly dark room, the differences between DaLite's HD Progressive, Stewarts better home theater materials, Draper's, and their DiY paint mixes.
I think if you have ever marked your screen by mistake, then painting is a bad choice. Painted surfaces tend to not be durable in the least and it's a fair bit of work to get a DiY screen, painted or otherwise, up in action.
I made a screen once. It was a fair bit of work. Making the frame was easy enough. A few hours one evening. Not bad at all. But, then stretching the canvas onto it was a bit more serious amount of work. Then making a black velvet frame for it. Well, the time added up quickly. The end result, while good, I think was no better than what SilverTicket does.
I have issues with some of the claims of the DiY screens. A lot of people take a ton of pride in their DiY formulas, and there's a million of them out there. But, when you go to DaLite and Stewart, their top of the line screens are white, low gain, and neutral in color. They aren't ALR screens, they are just white screens. They will explain it clearly that you don't want color, you don't want gain, you want a smooth surface with high diffusion for the best results. So, when I read about a DiY painted formula which has all the properties of a ALR screen... I cringe. ALR screens really suck. That doesn't mean that the paint formula doesn't do a good job and look excellent, it just makes me wonder. Unfortunately, I haven't seen more than 1 or 2 painted screens in my life, and they looked fine as they were not ALR formulas. But, not one bit better than a $300 SilverTicket screen either.
If I marked up my SilverTicket screen material, I would reach out to SilverTicket to find out about replacement material as the solution. They may offer it directly to you even though it isn't a separate line item on their website.
I really struggle with spending a ton on a nice screen unless you already have an amazing room. So, before saving, or spending, on a $2,000+ screen, first do everything you can to make the room the projector is in the absolute best that it can be.