10 First, we tackled the split in the wheel. We applied more putty than necessary to make sure we could sand the wheel into its correct form. We also used a bit of lacquer thinner so the putty could spread easier. The putty tended to ball up if it wasn't used. The lacquer thinner made it easier to move around. We also filled all the other gaps and nicks while the putty was pliant. Working time was about 15 minutes. Remember that it is fairly easy to bring the hardened putty down, so make it a bit taller than needed.