From a rust point of view the underbody of our Pinz was in good shape. Unfortunately it is/was one of these trucks who received a new body quite early and they tried some new things (which didnít work well). The metal was painted with a white paint and then coated with a plastic underbody coating. For one the coating didnít adhere well (better: not at all) to the paint and it was very brittle. For this reason the coating started to flake off in several places. On the other side itís a big advantage! Usually underbody coating canít be removed by sandblasting but the brittle stuff can! A test at a local sandblasting company (Pro-Blast in Mesa) showed good results. As it doesnít make sense to blast around the boxes I drove home after several test areas were sandblasted.
The Gerry-can holder, toolbox and rock shields were removed to allow sandblasting behind and above them........As a big surprise all bolts went off without any problems thanks to the Swiss maintenance. They all were dipped into some graphite grease prior to assembly!!!
The sandblasted underbody was treated with por15 metal prep and then painted with one layer of black followed by a layer of grey por15, a polymeric isocyanate derivative antirust primer. Using the different color por15 will show where you forgot to paint.
Two layers of Wurth SKS Stone guard (black, 5 liters) were applied by brush over the por15 primer to protect it from future hits of rocks. Due to the confined space in most places I applied the SKS with a brush which unfortunately doesnít allow you to make a thick enough layer in one run. Again, the grey last layer of por15 makes it easy to see where you screwed up......
Next step are the boxes and gerry can holder. They were taken apart, cleaned and the paint stripped. Only the battery box is done at this time as there are other plans for the rest.
© 2002-2005, K. Juergen Schoepf