Hi, I'm not at all experienced in car maintenance, but wondering if it's a good idea to follow some advice I got - I'm planning to drill small holes, maybe 6 or 9 mm, into hidden parts (normally from the inside/under direction) of each panel in the body and then pump a load of wax-oil inside to retard rust which has set in and is emerging upwards from the sills on my Merc van/truck (609D). Then I'll deal with the external/visible rust separately, sanding, treating and respraying.
Then I aim to plug each hole with a rubber grommet, which will enable me to renew the dose from time to time.
Do you think this is a good plan?
Would filling the panels with waxoil cause problems later if I need to do welding?
What sort of drill bit is best for this job? Obviously ones designed for metal, but do they do ones with a prominent guide-point which could anchor into a marker dent made with a nail? Or do they only make those drill bits for timber?
Thanks if you can offer any tips for this job
regards
Mothed