Should we use expired film or it’s garbage ?
What do you think of expired respoolers and old brand resellers of expired film ?
Should it be considered as good as it for experimental purposes or should we forget it ?
Buying outdated film to save some money and for offbeat effects are two completely different things. In the first instance, it's a perfectly sensible idea if the film comes through normal retail channels but is simply leftover stock, the film is of medium speed, e.g., ISO 50-200, and the cost is substantially lower than buying new film. Expiration dates are conservative, and professional films tend to be kept refrigerated. Even when one buys only fresh film, especially in quantity, there's a good chance that some of it will go past the sell-by date before it's used. In this scenario we're talking about a few years, not decades. Unlike B&W film, which may lose some density and contrast, color films may also show slight but correctible color shifts. Five years past expiration should not be a serious problem, especially if the film is kept cool.
Be careful about faster films: The main cause of deterioration is cosmic rays, which penetrate even lead bags, and of course your fridge or freezer. These can render film useless in just a few years if you live at high altitude. I would not buy outdated TMAX 3200, or even 800, especially if it came from a store in Denver. Every 3,000 ft above sea level will cut the shelf life of film by half!
Buying film in bulk, e.g., 100 ft rolls, and loading them into reusable cassettes, is a great way to save money. I used to do it all the time. I used a Watson 66 bulk loader. Just be careful with the cassettes. If not kept perfectly clean the light trap can collect dirt that will scratch the film. When in doubt use a new one.
I must say that I feel that a bit too much is made of the cost of film. It's possible that those who grew up in the digital age are accustomed to making a great number of images of the same subject because there is no cost penalty. If you think of film as an opportunity to make important images you will be more selective. And you have to buy a lot of film befiore you've spent as much money as on a really good digital camera system.
As for the second use case I have no advice.