Last but not least
Petroleum based Vaseline.
On all but the UR3, there was no signs of welts or damage of any kind. The UR3 had a big welt, as you can see. Once again, it was gone the next day.
Folks, I am at a loss here. For the last year I have read and told people about not using some lubes with some materials. Stating that it will destroy the toy. I have talked to some other contributors and they have told me about damage to their toys. Such as using a condom with silicone lube permanently deforming a silicone dildo. So I know that that damage can occur.
So in conclusion, let us just say this; Follow the recommendation on the packaging, manufacturers website and EF. Even though I can not show any permanent damage, I have no way of testing if while using a certain lube that some of the material is not leaching into our body's. Maybe that is another reason why companies recommend against it.
Personally I feel that some of these recommendations are from the past when materials where not as good as they are today. They have come a long way in the material department.