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Old 3rd March 2018, 16:56   #1
roverbarmy
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Default Mk 1 sill rustproofing ?

Having just had my sills and jacking points welded, I want to rustproof the inside of my sills. Am I causing MOT problems by drilling 10mm holes in the sills so that I can spray rustproofing materials in there with a 360 degree spray, then fit rubber blanking grommets, so that I can repeat the process each year or so? It's the sort of thing we used to do back in the 70's when box sections started to replace solid chassis. If I keep 300mm away from structural points, should I be ok???
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Old 3rd March 2018, 17:17   #2
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Use the drain holes already there also, take off the jacking pads, clean & spray inside, from the top, take off the chrome kick trim & spray inside
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Old 3rd March 2018, 17:19   #3
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I wouldn't of thought so , if in a neutral plane its not seriously weakening it. , but you could put holes on the inside, under the finisher, then they couldn't be seen.
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Old 3rd March 2018, 17:33   #4
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The worst areas are just in front of the rear wheel, dirt collects in a void behind the liner & festers, causing rust from the inside
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Old 3rd March 2018, 17:56   #5
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Just make sure the existing drain holes are clear and use them.
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Old 4th March 2018, 09:48   #6
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I have Waxoiled every two years using existing holes and jack pad recesses. provided the oil is warmed and good pressure is it gets everywhere!
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Old 4th March 2018, 16:09   #7
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Quote:
Originally Posted by roverbarmy View Post
Having just had my sills and jacking points welded, I want to rustproof the inside of my sills. Am I causing MOT problems by drilling 10mm holes in the sills so that I can spray rustproofing materials in there with a 360 degree spray, then fit rubber blanking grommets, so that I can repeat the process each year or so? It's the sort of thing we used to do back in the 70's when box sections started to replace solid chassis. If I keep 300mm away from structural points, should I be ok???
I have waxoyled the sills and then filled the sill cavity via the jacking pad hole with dinitrol cavity wax using a long spray lead - seems to get right into the sill void making sure you dont block to the drain hole.
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