There are two ways to make sign vinyl, and the difference shows up in year two, not week one.
Cast vinyl starts as a liquid, is poured onto a casting sheet and cured. Nothing is stretched, so the film has no memory and no urge to shrink. It is thin — around 2 mil — conforms to curves and rivets, and lasts the longest.
Calendered vinyl is extruded and rolled through heated cylinders, like sheeting pastry. That stretching leaves internal tension, so the film is thicker (3–4 mil), stiffer, cheaper, and over time tries to return to its original shape — which is what lifting edges and shrinkage gaps actually are.
| Cast | Calendered | |
|---|---|---|
| Thickness | ~2 mil | 3–4 mil |
| Outdoor life | 8–12 years | 5–6 years |
| Curves & rivets | Conforms well | Flat surfaces only |
| Shrinkage | Minimal | Noticeable over time |
| Cost | Higher | Lower |
| Right for | Vehicles, long-term outdoor | Windows, doors, indoor, short-term |
The practical rule: flat and temporary, calendered is fine and you should not pay for cast. Curved or expected to last, buy cast and stop thinking about it. The price gap on a typical lettering order is small; the difference three summers later is not.
| Film | Type | Use |
|---|---|---|
| ORACAL 631 | Calendered, removable, matte | Interior walls, wall quotes, temporary indoor |
| ORACAL 651 | Calendered, permanent, gloss | Windows, glass doors, flat outdoor |
| ORACAL 751 / 951 | Cast, permanent | Vehicles, boats, long-term outdoor |
If you ask for "651" and the job is a curved truck panel, a good shop will talk you out of it. That is a sign of a good shop.
Tell the shop the surface and how long you need it to last, and let them pick the film — that is their expertise. Design your lettering and note the surface in your order; see how to apply it once it arrives.
Type your words, style them, and send them to your area’s top-rated shops.
How it is made. Cast vinyl is poured as a liquid and cured in a thin sheet, so it has no built-in tension and stays where it is put — it conforms to curves and lasts longest. Calendered vinyl is squeezed through rollers like pastry, which leaves internal stress, so it is thicker, cheaper and gradually wants to shrink back.
631 is a removable matte calendered vinyl for indoor walls — it peels off cleanly for years. 651 is a permanent glossy calendered vinyl for windows, doors and short-term outdoor use, rated around 6 years outdoors. They are not interchangeable: 651 on a painted wall can take the paint with it.
Cast, on anything curved or long-term — ORACAL 951 or equivalent. Calendered vinyl on a curved truck panel will shrink, lift at the edges and crack, usually within a season or two. Flat van doors can take a quality calendered film, but cast is what a shop will recommend if the lettering matters.
Indoors, effectively indefinitely. Outdoors, quality calendered film runs about 5–6 years and cast runs 8–12 years, with strong sun shortening both. Desert sun is the harshest test there is — Arizona and Nevada jobs age faster than the same vinyl in Oregon.
Vinyl lettering runs about $10 per square foot of cut letters in 2026 — most orders land $25–$150.
Read the guide →Vinyl banners run $4–$7 per square foot in 2026 — a classic 3×6 lands $75–$125, hemmed and grommeted.
Read the guide →Yard signs run $15–$25 each with stakes in 2026, dropping near $10 at quantity 50+.
Read the guide →