Yes, we got the painting instructions (last page of the install instructions - only page in English!) - good idea to give this to your paint shop:

Guidelines for painting OETTINGER auto body parts
A visual improvement of the parts and of the vehicle as a whole is achieved by painting the parts after trial fitting.
Priming represents the first step when treating the surface. Additional steps such as sanding, cleaning, and filling are still to be completed.
For the finishing coat, we recommend following the guidelines provided to you by your paint supplier.
We would like to point out that PUR parts are made from a self skinning foam and may therefore have pores on the outer surface. These
have to be repaired by appropriate means, e. g., by filling and priming.
For a surface cleaner, we recommend using the plastics cleaner No. 85-81 from Spies-Hecker.
In order to avoid deformation of the parts due to material shrinkage, we recommend painting the parts off the vehicle and drying them at
max. 35-40 °C.
Follow these steps when painting:
Support the parts in a similar position to that which they are to be mounted on the vehicle. Don't allow the parts to bend, sag, or deform
during painting and drying. Deposit the parts carefully, otherwise you will encounter problems when mounting them, e. g., corrugation and
tensions in the part.
Preparing for the finishing coat:
Clean the part with plastics cleaner.
Sand the part with sandpaper (grain 600).
Remove all dust from the part.
If necessary, fill in any pores in the surface and wet-sand the part.
Clean the part with silicone remover.
Check the part and fix faults if necessary.
Finishing Coat: Solid Paint
* Mix 2 pack acrylic paint with 30 % elasticiser.
* Add to this mixture, 2 to 1 parts by volume, the 2 pack hardener and then add
thinners if necessary.
Finishing Coat: Metallic Two-Layer Paint
Finishing coat using metallic two-layer paint
* Paint 1st layer with metallic base coat.
* For 2nd layer, mix 30 % elasticiser with the 2 pack clear coat.
* Add to this mixture, 2 to 1 parts by volume, the 2 pack hardener and then add
thinners if necessary.
Caution:
Never dry parts at more than 35-40 °C. During painting and drying all parts must be set down fully supported in order to avoid deformation.
Do not cover up the part number with paint.
Notes:
We recommend marking the inside of the painted part with the VIN to ease identification in the case of theft.