Can mottling be removed or healed?
Heat and/or relieving winding tension usually removes mottling
Fortunately, mottling is easily removed. Except in severe cases mottling will fade and disappear within a short time: a couple of days in a shop, a couple of hours in sunshine and a couple of minutes under a heat gun.
Mottling can also be mitigated before cutting, printing, or laminating by slightly unwinding the roll.
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Release the paper tape.
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Pull out about 10 inches of material.
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Spin the film in reverse until the entire roll has been taken off contact with the adjacent wrap. This relieves any built-up pressure and will result in a uniform surface within a couple of days.