Mottling on Hexis Hexpress etch vinyl

[Rob36]

I carried out a job today covering 17 window panels in a workshop using Hexis dusted etch hexpress vinyl. I’d pre cut the panel sections, but perhaps stupidly didn’t release the vinyl from the liner to check it before arriving at the job - well the vinyl had quite pronounced mottling - looks like on the adhesive side, which didn’t fade with heat once on installed. I showed the client who told me it would be ok as it’s only a workshop, but it looks very noticeable on the windows in certain light. Has anyone experienced this? Will the mottling fade and even out? It’s definitely on the vinyl itself rather than a streaks or whatever due to uneven pressure. I know mottling can be a thing, but I expected it to improve with heat applied. I saw the guy having a close look when I left and hate the thought of someone being unhappy despite him telling to to carry on with it.,,