Paint, seam sealer, stone chip?

[Roadside]

I'm about to start welding up my old Iveco Daily. Inner and outer sills, arches, battery tray. I've done a bit of welding before but not much and I've previously just put brushable seam sealer over everything and left it at that. But I'm wondering if that is the right thing to do or if there is a better way? Should I paint the sills before seam sealer? Or after? Or maybe there is some other way to protect the new steel that I don't know about? Will paint and seam sealer react together? What about the stone chip paints? And what about the cavity between the inner and outer sills? Should I paint them before welding as I won't be able to get to everything once its all welded up. Sorry for the dumb first question(s)! The only thing I have painted instead of using seam sealer was a frame I welded up for a flatbed truck. I used red oxide primer followed by a coat of rustoleum but even that may have been the wrong thing to do (although it still looks ok a year later).

Any tips would be great, never had anyone to show me this sort of stuff so not really sure what's what. Cheers.

 

[steveo3002]

i prefer to primer all the bare metal before sealer

as for reactions , yes some might react to the solvent , thats where epoxy primer excels , once cured almost nothing upsets it

the inner cavity you can use weld through primer and then a cavity wax or acf50 once painted

 

[Keithmac]

I used Epoxy Primer on my Golf, excellent stuff to use as first coat over bare metal.

 

[Roadside]

i prefer to primer all the bare metal before sealer

as for reactions , yes some might react to the solvent , thats where epoxy primer excels , once cured almost nothing upsets it

the inner cavity you can use weld through primer and then a cavity wax or acf50 once painted

I used Epoxy Primer on my Golf, excellent stuff to use as first coat over bare metal.

Thanks for the replies. Just had a quick look and some epoxy primer listings say 1k and some say 2k. Whats the difference? Is there a specific one that you prefer to use?

 

[steveo3002]

2k is the one you want

if its underbody repairs jotun jotamastic is good as its thick but only comes in bigger cans ....any brand is leagues ahead of non epoxy primers

 

[Roadside]

2k is the one you want

if its underbody repairs jotun jotamastic is good as its thick but only comes in bigger cans ....any brand is leagues ahead of non epoxy primers

Thanks, will have a look for that. Not to sound too thick, but... After welding paint with this primer. Then Seam sealer over my welds (or over all of the newly primed steel?). Then should I paint anything over the top or just the 2k primer is enough? Sorry

 

[steveo3002]

clean down the repair , sand with something rough like 120 or more (never polish with wire wheel ) degrease then 2-3 coats of 2k epoxy

once thats gone off seal over any lap joins or seams to keep the water out ...then optional top coat or stonechip to give it a uniform appearance , but the epoxy alone is enough to protect it

 

[Roadside]

clean down the repair , sand with something rough like 120 or more (never polish with wire wheel ) degrease then 2-3 coats of 2k epoxy

once thats gone off seal over any lap joins or seams to keep the water out ...then optional top coat or stonechip to give it a uniform appearance , but the epoxy alone is enough to protect it

Thanks very much, this is very helpful!

 

[marlinspike]

Thanks, will have a look for that. Not to sound too thick, but... After welding paint with this primer. Then Seam sealer over my welds (or over all of the newly primed steel?). Then should I paint anything over the top or just the 2k primer is enough? Sorry

I've used HB Body 989 2k epoxy primer. It's one of the cheaper ones and comes in smaller tins.

I usually primer the bare metal, then seam seal, then primer again, then top coat. I used to use cartridge sealer but it would inevitably go hard in the tube so I now use the tub type like Upol Grey Stripe.

HB Body 989 4:1 Epoxy Primer/Surfacer 1L + Activator 250ml - GREY

HB Body 989 4 1 Epoxy Primer/Surfacer 1L Activator 250ml 2K high performance Epoxy Primer with anti-corrosive properties. Excellent sealing, adhesion

shop.autopaintsbrighton.co.uk

I occasionally use zinc primer in an aerosol but 2k epoxy is better. Yes, it's a pain to mix especially small amounts, but it withstands rust better than any 2k product imo.

 

[steveo3002]

ive used the hb too , as said its smaller tins , seems more than adequate

 

[Keithmac]

I use MIPA,

Pardon our interruption...

 

[Shedendman]

One thing to think of,esp sills,they rot from the inside more than the outside,so,you either stop water getting in or make sure it can get out,plus i'd give them a good spray/inject inside with some kind treatment (many flavours available)
And if anything the dailys i've had to do,you're in for some work,one place to double check are the inner front wheel arches and behind the front wings
Have fun

 

[Roadside]

Thanks all for the tips and links to products, much appreciated! Have just seen the post warning about how dangerous this stuff is though!

@Shedendman Yeah, I've got a fair amount to do on it. I did drivers side behind front wing (beneath windscreen washer bottle) a few years ago before selling the van. Now I've bought it back (don't ask! lol) and the other side needs doing under the battery tray. Haven't started stripping it back yet but looks close to the ECU so may have to remove that first. Then I've got inner/outer sills and outriggers to do. All good fun of course!

 

[steveo3002]

epoxy doesnt have the really nasty stuff in it . not to say you dont need to use protection though

 

[Roadside]

epoxy doesnt have the really nasty stuff in it . not to say you dont need to use protection though

Ahh ok, I just saw 2k and thought it was all the same stuff. I need to do some reading..

 

[bricol]

I used jotun epoxy over seams etc, then polyeurethane sealant, then it was painted some time after by someone who knows how to paint.

A decade later, still looks good.

 

[steveo3002]

Ahh ok, I just saw 2k and thought it was all the same stuff. I need to do some reading..

if its underneath i would brush it on , low risk when brushing anything

 

[marlinspike]

I'm pretty sure 2k epoxy is isocyanate free. There's been discussions on it over the years and I'm even pretty sure someone confirmed with Lechler that their 2907, which is popular on here, is iso free.

If it's for somewhere it won't be seen, or where you don't need a nice sprayed finish, you can brush it on. That avoids breathing any sprayed paint. I've brushed it on usually.

 

[Roadside]

Good to know, thanks guys. Inner sills underneath and outer sills will have plastic trim panels over the top so nothing will be seen. Brush it is then, cheers

 

[badabec]

For large areas I used a 4" roller. Make sure you get epoxy resistant rollers.