If I am not mistaken, Eraser contains lauryl ether sulphate - an extremely common surfactant (it will be in many shampoos, for example). This probably goes a long way to help with lubrication but it does have the potential to deposit on the surface.
Yes, this is the debate others were making. I`m told the percentage is low and that the with alcohol content in the product there should be nothing left on the surface that would interfere.
On the pictures, the eraser panel looked different after your wipe down. Both the IPA and water cleansed panels appear to be hydrophillic whereas the eraser panel is hydrophobic. Why, I cannot be sure but this indicates something is up. If the panels are all clean, they would all behave the same way. Soapy water is one people often get wrong because many of the ingredients in washing up soap are `sticky` and adhere to a surface for several rinses and give the appearance of hydrophillic behaviour when in fact the surface remains hydrophobic but has the hydrophillic surfactants temporarily `stuck`. However, your IPA wiped panel appears to behave similarly so I dont think that is the case here so that makes the eraser panel the odd one out...
Yes, I noticed this as well. Eraser beaded up on the surface initially and I really have no explanation for that. I did find it odd though. The pic for the water side was after the soapy water wipe-down. (To be honest I had originally planed to use straight water but I forgot I had added some soap to my water bottle for wet sanding a few weeks prior. it was too late once I realized it though)
Were you to do the test on a mirror, you might well be able to actually see any residues - this is how I test glass products for smearing, it is easier to spot residues than most other surfaces.
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