How does the water get into R107 rocker panels ???
 

A know fault on the R107 is rust in the rocker panels.

I have found a 1988 Model 300SL that seems to be in good condition for corrosion. I have been looking for some time. Most are already rusted out.

If I buy it I want to make sure that it does not go downhill.

Anyone know how water gets into the rocker panels as it seems to be a sealed area.

Any good idea's as to how to protect them (Externally and/or Internally)

I was thinking of cutting a small number of small holes (About 1/2 inch diameter), on the inside (Footwell), and spraying with a corrosion inhibiting compound. Plug them up after.
Also Zibert all round on the outside.

What other areas do I need to consider.

Mike

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The usual place is through the hood well. Water gets in through the seal on the lid, or drips of the hood when stored wet. This leaks out of the bottom of the well into the side panels or the boot.

Many 107s are run as second cars so don't get driven much. Condensation forms in all the box sections, including the sills, and doesn't dry out. Hence rust.

Watch out for cars from the west coast (of the UK!). Mine was from Glasgow and seemed to have suffered from too many short runs in a salty atmosphere.

Get the Waxoyl out and squirt it everywhere!