09/07/2026
Both of these went on clear.
One came off clear. The other is what happens when the chemistry is wrong.
There are two yellows in a failed PPF, and most people never hear about either.
The first is in the film. Cheap PPF is built on aromatic TPU — made from MDI or TDI, both carrying benzene rings. UV photo-oxidises those rings into chromophores and the film goes amber. Permanently. Premium film uses aliphatic TPU: HDI, IPDI, H₁₂MDI. No rings. Nothing for UV to rearrange.
The second is in the adhesive. The acrylic layer underneath can oxidise and bleed upward through a film that’s otherwise perfectly fine.
From the outside you cannot tell which one you’ve got. Not by looking. Not from the invoice.
And that ten-year warranty everyone quotes — read the words. It covers yellowing, cracking, bubbling and delamination as manufacturing defects. It says nothing about how the film behaves when it comes off. Nothing about whether the adhesive lets go. Nothing about whether your clear coat comes with it.
So we start checking at five years. Not because a manufacturer told us to — because acrylic adhesive keeps building bond the longer it sits, and aged film goes brittle, tears instead of peeling, and leaves its glue on your paint.
Sound factory paint almost always survives a proper removal. Resprays are where it goes wrong. That’s a conversation to have before the heat gun comes out, not after.
We install CARPRO Immortal — in CarPro’s own words, a clear-coated aliphatic polyurethane film on an Ashland acrylic adhesive. And we video-log every install: the roll, the batch, the work. Because in this industry a film gets quoted and a different film gets installed, and you find out in year six.
Ask your installer one question: aliphatic or aromatic?
If they can’t answer, that’s the answer.
📍 Heidelberg West · alphadetails.com.au.
