43 replies to this topic

[Shtstr]

Ok so I had a friend of mine Sandblast these this morning brought them home hit them with aquaclean rinsed them off after letting it soak and keeping it wet applied KBS rust blast scrub with wire brush in drill for nearly 20 minutes and have flash rusting when I rinse it off any ideas what I'm doing wrong I've done this twice now and end up with the same result. Yes wire brush is new

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Edited by Shtstr, 05 January 2018 - 04:40 PM.

[Shtstr]

WTF am I doing wrong.

???

They were freshly sandblasted this morning perfect dry environment bright sunny day 28 degrees low humidity.

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[Shtstr]

Before anyone says the wire brush is causing this even on the underside where I use the KBS without the wire brush it is rusting there too

It only showed signs of flash rusting after I rinse the KBS off was perfectly clean metal before

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[Shtstr]

Third attempt. Spoke to paint supplier he said to air blow the panel straight away after I rinse it off.

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[fx48_eh64]

all the rust preventers i have ever used you have to leave air dry usually overnight sort of thing,  i have never rinsed them off with water

[Shtstr]

Ok third attempt as per instructions from paint supplier I think it looks worse.

KBS says to rinse off after 15 to 20 minutes for lightly rusted areas

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[Shtstr]

Instructions clearly say do not allow product to dry on panel.

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[Shtstr]

4 attempts and 3L later even scrubbing it with a brand new green scourer no better.

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[Shtstr]

Ok found this on a website and instructions are different from what is on the bottle. MMMM

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[Shtstr]

Using the last litre I have now to do it for 30 minutes and see what I come up with.

Shouldn't have rusted instantaneously bomber

Edited by Shtstr, 05 January 2018 - 10:16 PM.

[Cook]

I've used KBS on a lot of parts and never had that problem.  You do need to keep the part wet during each of the 2 stages and its hard to keep a large part completely wet for 10 or more minutes. Also it does  need to be completely dry between stages.  And as per instructions they need to be washed off so I think you are doing it correctly . Only thing that may be different is that I have never used the aquaclean at full strength.  Maybe the active ingredient in it is causing the flash rust? Good luck with it.  Cheers Ron 

[Shtstr]

I only use the Aqua clean at the recommended strength

[fuzzypumper]

When i used KBS I aqua kleened using a scourer , rinsed off, let drip dry a little then hit it with compressed air to dry off.

 

Then while dry sprayed rust blast on and used the scourer again, let it soak 20min continually  spraying so the rust blast doesn't dry before rinsing.

When rinsing off thoroughly with water I  used the scourer again while rinsing but very lightly, only to help the excessive zinc phosphate build up

you get in some spots, either because it dried prematurely or didn't rinse off properly.

I let it dry dry again for while and finish the drying process with compressed air.

 

There will always be a light rusty coloured haze is some spots buts part of the keying.

if you have large area of  white phosphate build up and you rub finger and leaves white on your finger, spot scourer it again  blast and rinse again.

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Edited by fuzzypumper, 05 January 2018 - 06:57 PM.

[Shtstr]

Well now has been done 5 times and how fuzzpumper has se described is basically identical to what I have done and this is what I have ended up with after 35 minutes. No build up as I made sure it was continuously wet that is why I've gone through so much of the rust blast.
Not buying anymore will put this back into my own Sandblaster and hit it again and then paint over it.

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Edited by Shtstr, 05 January 2018 - 10:18 PM.

[grumpy xu1]

You should be able to sand blast them, blow the dust off, wax & grease them & etch them straight away & if you can't. Then it's just shit. That's the simple truth. The steel has basically had the impure top removed from the sand blasting process.

[Shtstr]

Grumpy xu1 that is what i have always done. Was trying to do it differently this time as everyone raved about por 15 and kbs stuff. I know what i will be doing with the rest of it.

[grumpy xu1]

You are bad mouthing a product that is performing perfectly?
FFS it was fine to coat the the first time you did it. 
It was fine to coat the second time you did it. 
It was fine to coat the third, fourth, and fifth times you did it. 
How the hell is this KBS's fault?

Yeah i can't see pics on the forum still bomber, so I'm making my assumptions on people's wordings. But I've done the same I've mentioned with the little por15 i have used. No problems before.

[Shtstr]

You are bad mouthing a product that is performing perfectly?
FFS it was fine to coat the the first time you did it. 
It was fine to coat the second time you did it. 
It was fine to coat the third, fourth, and fifth times you did it. 
How the hell is this KBS's fault?

Whatever all I was asking is what I was doing wrong.

[tuxedoss]

As Bomber said what you see is quite normal, . I've used both the KBS and POR versions and they both do the same thing. I think the websites even describe the brown rusty look. But if the steel was sandblasted you're far better just painting it straight away with the KBS, it sticks to the rough surface incredibly well, the rust blast is only needed to be used on rust or smooth clean shiny steel as it etches the surface for the KBS to attach to.

I just had 2 door shells minus skins blasted and picked them up and drove straight home and painted the inside with KBS satin on the fresh clean blasted surface, went on nice and smooth with a brush. Had a couple of little dents I didn't notice on bottom of door and gave them a few hits with a hammer and dolly and didn't even mark the KBS. 

[Shtstr]

On the website it describes a white powdery surface doesn't say anything about a brown stain.
The reason why I was using the KBS rust blast is because I wanted to leave it as bare metal for a little while until it was attached to the inner guards of the Torana before painting.
Not at any time did I have a go at the product.
All the way through the post I have been continuously thinking I am doing something wrong.

[tuxedoss]

Ok so your not coating it with rust seal and just want to protect it, got it now. It’s hard to find but best stuff to use by far is paint grip 253 also caked Kephos. It’s a clear coating that protects for months and can be painted over or wiped off with thinners if you want . The blaster I use coats everything with it when he’s finished . It only comes in 20L but you might find a blaster willing to sell you a litre

[Cook]

FWIW I was just reading another thread  "Paint grip 253" (sorry can't copy the link) and it refers to the browning of the metal as the reaction and not rust.  Interesting produt by the way.  Cheers Ron