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Unread 02-01-2014, 10:48 PM   #1
J03_TJ
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Post welding protective painting

So was just sitting here and thought I'd ask a question to the fabrication crowd. Hopefully it's not a well covered topic, sorry if it is. Probably over thinking this, but hey why not ask.
Wondering about welding a reinforcement plate to existing flanges or mounts. Say a guy was going to put a plate onto an existing part to stiffen a mount. I know to remove the paint where the weld is going to lay. I'm wondering about if you totally clean both parts and there is no paint on the existing flange then you weld the new plate on top of it. For some reason you can't weld all around the new plate, so there are gaps for water or muck to get in between the two. Wondering if there are any solutions or solvents that can be poured into the seams that might wick into the gaps to create a rust barrier between the two plates. All I know is to apply several coats of rattle can paint, wondering if there is another tactic. Course, I know this is up there with worrying about the sky falling, but thought it would be fun to ask.

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Unread 02-02-2014, 09:43 AM   #2
rjbruzan
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I spray RustOPeum cold galvanizing into areas like that. While its still very warm I will spray it into the crack or unwelded portion of the seam. Then when cold a second coat. Next the open areas not welded will get a coat of seam sealer or caulk. I live in the land of rust and this helps it last longer. Everything gets a final topcoat when complete.

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Unread 02-07-2014, 02:27 AM   #3
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X2on running a bead if caulk. Wet ur finger and draw it along for a good finish. I use a shot glass of water, works great. Once it dries and you spray oInt over it, no one will ever know.
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Unread 02-07-2014, 07:33 AM   #4
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Thanks for the info. Guessing the caulk that you guys are using is somewhat flexible so it doesn't get dry and brittle. I would think if its flexible that rattle can paint might not stick to it well?? Any brand or type suggestions?
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Unread 02-07-2014, 08:52 AM   #5
rjbruzan
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I found a DAP caulk that is rubberized that is paintable when dry. Ive got a tube in the garage so Ill look tonite.

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Unread 02-07-2014, 10:07 AM   #6
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Another option pretty much made for your purpose and tough stuff..flexible and paintable...no need for the pricy epoxy gun ,just a simple caulk gun
3M/12 oz. grey Dynatron auto seam sealer caulk (550) | Body Repair and Accessories | AutoZone.com
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Unread 02-07-2014, 10:18 AM   #7
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we have used the basic silicone in a tube from home depot-- a generic caulk gun works great. let it dry and hit with the rattle can. some are over 10 years old and still look great. worst case? hit it again with the spray paint.
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Unread 02-07-2014, 10:57 PM   #8
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Thanks guys, glad I asked the question. Great info.
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