Originally Posted by fredcandetail
Mike can you add more to the reason why it is not recommended for leather....
I've never been told the chemistry reason why M40 is not for use on leather but I can take a guess that a product formulated to use on man-made materials is different than a product made to be used on animal skin.
Although some leather is coated, a dressing manufacture has know idea what each person in the world is working on, whether it's coated or not coated, so a safe approach is to tell people to,
- Use vinyl products on vinyl
- Use leather products on leather
Then hope that this simple, common-sense approach reduces any potential problems of liability and correctly used, nothing will go wrong.
Sometimes a good practice is to pick a brand you trust and then trust that they've done their homework and know how their products are best used and best used safely.