GTechniq - Car Care Products - C4 Permanent Trim Restorer - 15 ml Description Restores trim to “as new” condition without altering gloss level. Strong UV absorption filter and chemical bond ensures maximum durability with a single application typically maintaining a flawless finish for up to two years. Gtechniq C4 Permanent Trim Restorer renews the color of trim, but it does not add artificial gloss. Matte surfaces will remain matte. Trim pieces will look new, not dressed, to give your vehicle an overall newer appearance.