It is not advised to install window tint over existing aftermarket window tint. Tinting over tint is not a great idea for quite a few reasons. The adhesive in window tint is meant to adhere to glass, not other window film so it is best to remove any existing window film before applying new tint.
If you choose to double layer window films, it is best to wait 1-2 weeks between layers so that the first layer can fully cure to the glass.
Can I tint over factory tint?
In the case of factory tinted windows on a vehicle, it is absolutely ok to tint over the factory tinted glass.
Factory tint and aftermarket tint are very different. Factory tint is a tint within the glass; the glass itself is a different color. Aftermarket tint is a film that is placed over glass; it can be removed and reapplied.
If you’re purchasing a car secondhand, it may not be obvious whether or not your vehicle has factory tint or aftermarket tint. To determine the difference, check the edges of the glass to see if you can spot an edge of the. film.
Can I put 2 layers of window tint?
Yes you absolutely can and may not have any issues. Though it is not advised, depending on the condition of the existing film and environment the vehicle is in, you may have no issues. It is important to note that if you do have a problem, there will likely be absolutely no warranty coverage.
Manufacturers warranty’s are voided when a film is applied on to another film so keep that in mind when deciding whether to layer tint over tint or to remove the existing tint before having the new window film installed.