Internally protecting sills

Internally protecting sills

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Discussion

HustleRussell

Original Poster:

24,602 posts

159 months

Monday 10th August 2015
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My E34 BMW is going to need new outer sills at the very least.

The bit that's always confused me about sill repairs is when you are welding the new outer on, you are effectively boxing the area in- so how do you deal with the uncoated areas inside the sill which were stripped in prep for welding or where the coating has been burned off by the welder? Can these areas be painted or is it literally a case of filling the thing with cavity wax and hoping for the best?

S0 What

3,358 posts

171 months

Monday 10th August 2015
quotequote all
Treat all the cleaned back areas with weld through zinc primer, that's about all you can do, after that as you say it some form of cavity wax, there are plenty out there but i tend to use waxiol either heated to aid flow or with some added diesel, i prefer heated as it cools and thickens and doesn't drip for days after like if you thin it with diesel.

227bhp

10,203 posts

127 months

Tuesday 11th August 2015
quotequote all
You can spray paint in there using the injection equipment, but it's messy and expensive. Depends on how long you want it to last....