It boggles my mind why some people cheap out on vinyl.
I've worked for a big company for years, I've done hundreds of vehicle decal installs, box wraps, you name it. Just the print quality alone, not even install quality... But the way the decal looks on ij35 compared to 180 is day and night.
I started my own side business, and someone wanted me to use ij35 for a bunch of decals for his car... I told him no, that even if he didn't mind it, I don't want my name to be associated with shoddy work.
If his friend says your decal looks like shit, or your wrap is bad... Do you think he'll say "yes, I cheaped out" or do you think you're about to have your company bad-mouthed and blamed?
The only thing we use ij35 on is real estate signs we know will be up for less than a few months. 180 + 8518 is $1200 Canadian (I imagine you Americans get a much, much better deal). $1200 / 675 = $1.77 per sqft. So your 24 x 24 decals will cost you $7. Ij35 would cost probably half that. So you save $3.50 on a job your probably making over $100 on with an install. Is it really worth it to go with cheap vinyl?.. even for huge decals, it's not much more cost efficient to use ij35.
Our shop been around for 20 + years. I can't count the number of times I've had to redo something on one hand due to failed vinyl (been there over 2 years). I don't have enough fingers / toes to count the amount of times someone has come in to get something redone from another shop, that used callandered vinyl, or cheap vinyl that was peeling, or cracking, or fading in then two years.
Callandered material has it's uses... Putting it on a car isn't one of them. Do your customers a favour and bake the extra few bucks into your quote, and use cast.. even if they're cheap and opt for callendered.