That's probably a winner for the type of vinyl interior scratches in the OP's Tiguan. I was actually going to post a new thread -- "Experiments with Old, damaged interior vinyl" -- because I've discovered some things of interest.
The truck I had mentioned previously with the 10"-long crack in the vinyl dashboard also had a stiff vinyl leather-textured door-handle with a chunk of vinyl and the underlying foam rubber pulled off, so that the remaining foam rubber turns dirty-yellow and continues to come apart in little chunks. Maybe the door-handle "works", but it was unsightly.
Posting on the Computer Hardware thread for years, I'd learned over that time that you can sometimes find useful materials in your household trash can.
For that kind of damage, repairs can be made without a kit. First, find a vinyl milk-bottle of the quart or gallon size, and cut out rectangles of flat and right-angle pieces. [Of course -- clean off the pieces thoroughly . . ]
Second, a roll of black foam-rubber 3/8" x 1+" weatherstripping comes in handy. It has an adhesive backing, and can be used to rebuild the foam rubber in the damaged area.
An Xacto knife or Xacto saw [similar to a dovetail saw] is a useful tool.
Finally, the coup-de-grace of seeming unlikely choices: An ample tube of fresh SHOE-GOO obtainable for about $3.00 at the local shoe store or Walgreen's Drug Store. I have yet to try a product called Amazing GOOP for auto repairs, but it is probably the same thing. LockTite Vinyl, Fabric and Plastic Adhesive works, but it is too thin and sets up too slowly. Frankly, the SHOE GOO is probably the best stuff -- described as "liquid vinyl".
The milk bottle cutouts are thick enough to repair the stiff vinyl I've described. A thick-mil piece of plastic drop-cloth would serve better as backing for a rip in a soft vinyl seat cover.
You'd want a can of Dupli-Color Vinyl Paint made for interior repairs, and you can likely find a color that is either a close match or an exact match. Also, some 80-grit and 120-grit sandpaper comes in handy. You can cut the milk-bottle rectangles so that there are over-sized tabs to fit under the remaining original vinyl that has been trimmed to provide clean straight edges. Insert the Xacto knife between those edges and the existing foam rubber, and the repair pieces can then be dabbed with glue and secured so there are no "weak" spots in the repair.
First time around, my door handle now looks and feels "good enough fo' gov-mint". Next time, I can say that it's possible to make it all look invisible.
As you reconstruct odd-shaped parts of the repair, the initial infusions of SHOE_GOO may leave air pockets. You can drill holes in the milk-bottle vinyl to inject more GOO into the repair. Then, lightly scratch up the resulting surface(s) with 120-grit; mask off the repair area; shake that can of Dupli-Color, and shoot that bad-boy repair-job.
Voila!