I guess I'll will jump in here since there has recently been some discussion about oil tank embellishers on the internet as well as at RAA X. I have made several of these in years past and made them in several ways. Here is mine by the way:
What has worked best for me is a piece of 3/16" (about 5mm) ABS plastic with self adhesive "laser foil" engraved with the image of your choice. I have had mine on for several years with no issues. The plastic back allows the embellisher to easily conform to the curve of the oil tank.
I have only done black that engraves leaving a brushed aluminum look, but I will check and see what other options are available.
I will not be able to start on these until the end of May as I have another project going at present. I will also be offering some neoprene tank pads that can also be engraved with the image of your choice.
I will start another thread titled "Oil Tank Embellishers/Tank Pads" to gauge interest.
Thanks,
Lonnie