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Old 04-18-2009, 02:18 PM
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weld repair floor boards

Is it better to weld sheet metal floors from the inside or underneath?I,ve been cutting the rust out in square shapes and laying new metal over top and stich welding and alpying seam sealer .But the underneath,I,m not sure what to do .If you lok at it from under the car you cvan see the cut hole it just has the metal over top of it.I don,t care what it looks like but I,m afraid water will ge between the old and new sheet metal.Should I weld it from under too?Should I just seem seal it and undercout it?Should I start welding from under?

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Old 04-18-2009, 04:49 PM

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My thoughts

I would not weld in new metal over the rusty section. I would remove the rusty panel, and replace in with new piece. I would weld it from the top, then grind top and bottom. I would stich weld it , but in the end, it would be welded solid. Then I would imediately coat it with epoxy primer to seal it from rusting any further. Sealer can crack, ect and cause safety issues (exhaust leaks) down the road....Just my thouhgts.
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Old 04-18-2009, 05:02 PM
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We all know it is "better to have nicely fitted patch panels" ..but since you have started this way tack weld from underneath and then do the seam sealer deal on all the joints to help keep moisture and salt out of the joints..Not perfect but workable..

Try making the patch panels to fit it is not all that difficult once you do it a couple of times and get the hang of it..

I have tried most all of it and now do what is known to work..
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Old 04-19-2009, 07:45 PM
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I agree with everyone else. You've gotta pretect it from moisture and forming new rust. Try this. Before adding your new piece coat it with a product called (onestep) or ospho or por-15. These products are all rust incapsolators. I would weld both sides only after applying some kind of rust inhibitor between the overlapping layers. Seam sealler never hurts and undercoating is a must.
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