Weld through paint

[trummy2500s]

Can anybody recommend a good weld proof paint . I am fitting new sills and want to make sure all steel is protected

[hairymel]

no such thing as weld proof paint, around where you weld the paint will burn off.
weld through also is a bit of falsehood too. you will usually need a bit od bare metal to strike the arc up on and any paint on the metal being welded will cause contamination of the weld.

i use toolstation cold galv spray paint on the inside of panels i weld on and would suggest a good dousing with cavity wax afterwards.

i am sure others do it all differently though ;-)

[moglite]

Mar 18, 2018 17:46:28 GMT hairymel said:

no such thing as weld proof paint, around where you weld the paint will burn off.
weld through also is a bit of falsehood too. you will usually need a bit od bare metal to strike the arc up on and any paint on the metal being welded will cause contamination of the weld.

i use toolstation cold galv spray paint on the inside of panels i weld on and would suggest a good dousing with cavity wax afterwards.

i am sure others do it all differently though ;-)

That is how I'm doing it too - the Toolstation stuff is nice to work with, and easy to get hold of.

20 years time, and we'll know about its longevity - if I make it that long ;-)

[kevins]

the weld through stuff is conductive so you can strike an arc or spot weld through it.

As said it will burn off around the weld though, the only real way to protect this really is a wax or oil which creeps well, even production e-coats don't always get between close fitting panels.

[droopsnoot]

I thought that, but I bought some weld-through primer from one of the restoration people at a show (LB I think) and it wasn't, I still had to scrape a bit off to get the MIG to start up, or start on the "upper" panel when plug welding. It seemed to me that it was just a water-based paint. I used it where I had two panels flush (plug welded) and wanted something on the mating surfaces, but then I've had aerosol red primer that seems to have lasted just as well near a weld.

[Deleted]

Only the really good quality / proven weldthro' primers work - I use a trade only product that is manufactured by Kent Europe - they have to work has the large / main dealer accident repair centres & bodyshops have to be able to guarantee the repairs made for several years in order to comply with the manufactures anti corrosion / rust perforation warranties - I would not bother with the cheap stuff it just does not work - the Bilt Hamber one works fine and is proven - link below

www.bilthamber.com/paints-and-coatings/etchweld

[phillipm]

As above, the cheap 'weld through' primers are terrible, Etchweld works incredibly well and is non-porous too boot, and surprising as it may be Halfords own isn't bad either.

[slater]

I've bought a box of the stuff frosts sell before and it works ok. othwerwise the bilt hamber stuff is about the same price by the looks.

[foxye28]

I have a box of Frost stuff, not used it yet but i'll report back when I have

[darrenh]

if you are asking for stuff you can spray on backs of panels in the category of hopefully does not burn off and hopefully gives a tiny bit of protection in cavities where you cant reach afterwards. then i recommend indasa zinc weld primer

if you are asking for stuff you can spray on backs/fronts of panels with the express intention of it being electrically conductive and easy to weld through it, then upol weld#2

the reason i found out about my first paragraph, is trying to use it for the second paragraph and it was like trying to weld mahogony. i've also used indasa stuff as temporary top coat in outside conditions, which turned into full time protection due to general malaise, but has remained rust free for over a year