Hi All,
Have been trawling the threads and see that there isn’t really a consensus on the best coating when refurbishing subframes.
- POR15 is affected by brake fluid
- Powder coating sheets off
- etc
What’s the best way to go?
Zulu


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Zulu...

1967 mini Cooper S

I have been pretty happy with the KBS products. Black top or something I think.

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

I used KBS Rust Seal on the sub-frames which is a moisture cured urethane very similar (I believe) to POR 15. I am using Dot 5 brake fluid which wont eat paint. I have had the brake fluid overflow on to the body paint (2 pack) and the sub-frame with no affect. So far I am happy with my choices.

I've not had issues with POR15 and brake fluid - even when I brushed it on on purpose to try and get it off! Haha!

I've always just had my subframes sandblasted and painted with industrial / marine grade epoxy primer and top coat.
My oldest one painted that way has been sitting in the backyard for a decade in the sun - it's a bit faded but otherwise still pretty good.

I'm a fan of POR15. No issues with brake fluid myself.

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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo

I had my subframes blasted
I then used por 15 and over laid it with por 15 chassis black
which is a mat finish
Though as old boots
spilt brake fluid on the front sub frame whiles changing a brake switch ,
had no effect on the paint

Mark

No other way to go, grit blasting then powder coating .Not expensive .Por does go dull

I've used KBS rust seal on all mine so far and it is tough and doesn't chip off easily-also had no problems with brake fluid at all.
I'm getting the subframes of my current project blasted and then powder coated at the moment.
Mainly because it was cheaper and easier than painting them myself but i do expect it to chip off more easily than the KBS product.
If i were not doing it the lazy way-I'd choose the KBS Rust Seal (same product as POR15-just made in Australia and cheaper to buy).

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Your imagination is only limited by the size of your wallet
"61 850 original and crusty (Mavis)
"64 Smooth Roof Van (Colin)
"67 Deluxe resto project (Monty)

Por 15 is not uv tolerant and will dull off if exposed to sun ( uv )
that is one reason I went over it with chassis black
not that the subframes see much sun light
powder coat chips and then starts to peel

my preference only , I don't like powder coat

Mark

Same, if you're worried about fading, use the chassis black top coat. I found it far superior to powder coating in my experience, particularly for something that can get but by rocks etc. My powder coating experience has included chipping and more fragile than POR15.

But at the end of the day regardless of whether you ask about coating, oil, radiator etc, on a forum you will get a range of responses from people and each will believe their method is the best not unlike religion.


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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo

My opinion.

Once powder coat peels there's no stopping it.

Do sand blasting companies apply POR 15? Or is that a “self application” activity?


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Zulu...

1967 mini Cooper S

But owning and working on a Mini is a religion, isn't it?

Don't we all worship the hallowed ground our Mini stands on?

A Mini badge is like a high priest, to be held in reverent esteem, and the S badge is the deity at the pinnacle to be exalted, much like the Dalai Lama in the Buddhist faith (or Mr. Bridger in The Italian Job).

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Haha winnabbey.

Zulu - the sandblaster I have used asked what finish I wanted. I selected just etch primer (not a great choice I have learned). But I got the impression he would apply other coatings if I so desired. I guess it'll depend on the shop.

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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo

I painted both my frames with POR15, the rear one is holding up but the entire front one is peeling off and wrinkling around the MC's. I won't use it again.
I'm not upset with the product I just will try something else now.

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Respect mine and I'll respect yours.