Hi Norm Mf and Jeff
Sometimes I mix in a little spray paint with epoxy glue and that works ok Norm to change the colour , maybe a little paint mixed with the stud adhesive may fix the colour problem if the wheels that are done with the tile pointing filler don't last.
Another thing I was thinking but don't know how good it would last is to melt down plastic drink bottles
and plastic fill the wheels.
https://www.google.com/search?client=firefox-b-d&q=How+to+Melt+Plastic+Bottles+for+MoldingPlastic Pellets another possibility
https://www.ebay.com.au/itm/Polymor...t-62-C-Polycaprolactone-PCL/273400572908Not sure how many wheels this liquid plastic would repair
https://www.ebay.com.au/itm/Smooth-Cast-Semi-Rigid-Rotocast-Trial-Kit-900gmSC65D/292253474297Cheers
Max.