Epoxy Primer

[Dcal]

Im stripping my Moggy Truck down for its second restoration in my ownership. I put a new chassis on it back on 89 & the chassis arrived sprayed with hammerite, (yeah i know its junk) Anyway i stripped all the hammerite off as it was too brittle & was chipping off in sheets.
The whole chassis & underside of the car was done with two pack zinc rick epoxy & epoxy pitch made by a local supplier Hamptons paints (long gone). It has protected the truck well but after 29 years its starting to lift here & there, the metal is good underneath It just seems to have gone hard & brittle & chips off easily, stripping with the power scraper is easy.
Now i hear great things about Jotun 87 & am liking the idea of using that. I have used jotun paints on boats several times so am familiar with the stuff
Has anyone used the Jotun zinc rich epoxy as a first coat or is this overkill? Im 59 now & dont want to have to do it again!

They do and I have.
Jotun Barrier 90.
It's great stuff but needs better prep than the 87 / 90 type so ideally grit blasted before application, if that's done it will last 20 years in highly corrosive environments like marine, so should be fine for your job.
If you can't blast or bristle blast which is the recommended mechanical prep, I'd use 87 or 90A which has added aluminium that gets you most of the performance of the epoxy zinc, but is nicer to use doesn't need as much prep (but the better the prep the better the performance) and it's cheaper.
If done right you shouldn't need to worry about doing it again.
It's what I did on my alfa project and the thread gives a reasonable amount of detail on the process.

 

[Dcal]

You can get 1:1 epoxy, Jotun do a version called smartpack.

I am going to give the smart pack a try when I next need paint, it seems ideal for the sort of stuff I do.

 

[Keith 66]

I just ordered a gallon of the Jotun 90 A & a topcoat to go over it. Out of interest I have been stripping the truck down the last two days & have chopped some of the rust out on the right hand side. Back when it was first restored in 89-91 I used hamptons zinc rich epoxy & 2 pack epoxy pitch. It has rusted out from the inside bottoms of the door pillars, the coating has stood up really well & most of it is still perfect with only a few tiny rusty bits from chips here & there. If i had kept up with the waxoyl or similar i wouldnt be having so much welding to do today. Not bad for 30 years.

 

[Furiokid]

I’ve got 3 days off work and been stripping the car back to bare metal slowly, managed to get a majority of the outside done yesterday, and then some of the inside done today and one arch. I haven’t put any primer on yet purely because if it hadn’t dried overnight I didn’t want it slowing me up the next day, so my aim was to finish as much as I can by the end of my few days off, then cover all the areas I’ve managed to bare back to metal in the Epoxy Primer.

Any issues with that? I know I shouldn’t really leave the metal bare, but it is inside my garage obviously, and as said, I’d rather do it one?

 

[vw1]

I take it by the roll cage and other mods you be taking this bug down the 1/4 mile ?

 

[Furiokid]

I take it by the roll cage and other mods you be taking this bug down the 1/4 mile ?

I’m building it as a track car, it’ll be running a Subaru EJ20 Turbo

 

[Kram]

I am going to give the smart pack a try when I next need paint, it seems ideal for the sort of stuff I do.

Interested to know whats the advantage over normal stuff?

 

[Dcal]

If the makers blurb is to believed it has a few advantages, main thing for me is it's thinner and designed for brush and roller application, also a lot easier get the mixing ratios right.
I'd like to see how it sprays as well.

 

[Dcal]

I haven’t put any primer on yet purely because if it hadn’t dried overnight I didn’t want it slowing me up the next day, so my aim was to finish as much as I can by the end of my few days off, then cover all the areas I’ve managed to bare back to metal in the Epoxy Primer.

Any issues with that? I know I shouldn’t really leave the metal bare, but it is inside my garage obviously, and as said, I’d rather do it one?

As long as it doesn’t flash rust while it's sitting it should be fine and even a bit of flash rust shouldn’t be a problem.
However it all looks very shiny, wire wheel and / or a stripping disc in a grinder by any chance?
Give the whole thing a going over with 120 sandpaper in a DA sander and you will get better results.

 

[Burdekin]

If the makers blurb is to believed it has a few advantages, main thing for me is it's thinner and designed for brush and roller application, also a lot easier get the mixing ratios right.
I'd like to see how it sprays as well.

I believe Rust Buster repackage it as this as well: https://www.rust.co.uk/product/rusty-s-tips-on-how-to-use-epoxy-mastic-121-231

 

[123hotchef]

this is intersting, never thought to spray the 87

 

[Dcal]

I believe Rust Buster repackage it as this as well: https://www.rust.co.uk/product/rusty-s-tips-on-how-to-use-epoxy-mastic-121-231

Don't know if it's the same stuff, but it's handy to get it in smaller packs.
It is at least twice the price though.

 

[Dcal]

this is intersting, never thought to spray the 87

It sprays well if you thin it and use a 2.5 fluid tip.

 

[Burdekin]

Don't know if it's the same stuff, but it's handy to get it in smaller packs.
It is at least twice the price though.

Check out the data sheets. They use to be identical. Rust Buster just sells products, he’s no paint manufacturer.

 

[Burdekin]

this is intersting, never thought to spray the 87

I am going back to 80 I think for cars, it sprays and lays much better than 87.

 

[123hotchef]

It sprays well if you thin it and use a 2.5 fluid tip.

hplv? or old school gun

 

[123hotchef]

I am going back to 80 I think for cars, it sprays and lays much better than 87.

never tried it only used the 87 last year 1st time loved it but brush on

 

[Furiokid]

As long as it doesn’t flash rust while it's sitting it should be fine and even a bit of flash rust shouldn’t be a problem.
However it all looks very shiny, wire wheel and / or a stripping disc in a grinder by any chance?
Give the whole thing a going over with 120 sandpaper in a DA sander and you will get better results.

Been using a little bit of both, but was thinking of using my orbital over the whole thing before giving it a coat of Epoxy

 

[Dcal]

Been using a little bit of both, but was thinking of using my orbital over the whole thing before giving it a coat of Epoxy

That's the way to go.
Don't be afraid to use coarse paper

 

[Dcal]

hplv? or old school gun

Cheap gravity gun as in the post below

25 year old Alfa 75 back from the brink (hopefully)

I use Dinitrol rc900 on bare steel for the same reason....basically as a rust converter and primer...then epoxy over the top. So far I've had good results.

www.mig-welding.co.uk