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what does it mean

Started by _TUFF75LH355_ , Apr 29 2011 06:42 PM

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19 replies to this topic

#1 _TUFF75LH355_

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Posted 29 April 2011 - 06:42 PM

whats does it mean when ive sprayed 3 coats of etch primer over baremetal let it dry than it scratch straight off with my finger nail..

steps i did

strip paint
bare metal,
deoxidised than etched

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#2 _Bomber Watson_

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Posted 29 April 2011 - 06:46 PM

Prolly means your using a single pack etch??

And your putting it on to thick, Etch is just that, an etch coat. See through is good.

Cheers.

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#3 _TUFF75LH355_

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Posted 29 April 2011 - 06:50 PM

so bomber should i just put one coat on..??? or what should i do..??? need help im had it up to my ears with panels lol

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#4 _TUFF75LH355_

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Posted 29 April 2011 - 06:52 PM

do i have to deoxidise bare metal if its not rusty

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#5 _TUFF75LH355_

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Posted 29 April 2011 - 08:27 PM

????????????????????????????

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#6 wot179

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Posted 29 April 2011 - 08:43 PM

Yes.

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#7 _Bomber Watson_

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Posted 29 April 2011 - 08:44 PM

????????????????????????????

frOckin hell I do have a shed and do have my own stuff to work on without worrying about everyone elses shit....Dont have the internet in the shed yet....Some things do take time...

One light coat.

Deox seems to be the go before priming, yes.

Cheers.

Edited by Bomber Watson, 29 April 2011 - 08:53 PM.

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#8 _LH SLR 3300_

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Posted 29 April 2011 - 08:50 PM

Deoxidine gives you a better guarantee that surface rust won't come back, as soon as bare steel is exposed to oxygen, it begins to oxidise even if you can't see it with the naked eye. Even more so in humid conditions like we've had of late. Bomber is correct about only applying a "half" coat of etch primer, also some etch primers won't adhere to panels treated with deoxidine, i usually scuff back any deoxidine treated panels with P240 & or coarse scotchbrite pads, blow the panel off & apply the etch primer. I'm not a painter & Bomber is probably better at steering you in the right direction & i'm sure he'll correct me if i'm wrong. Cheers Matt

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#9 _Bomber Watson_

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Posted 29 April 2011 - 08:52 PM

Na thats on the money ^^

Im only an industrial painter remember

Cheers.

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#10 71xu1

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Posted 29 April 2011 - 08:53 PM

True most etch primers should be sprayed see thru. But not all Watyl Super Etch and Altra Etch are two that come to mind (both 1k) that can be sprayed on as you have done without a problem. What brand etch have U used? and did it come with a MSDS sheet? the best bet is to follow the manufacturers instructions. I think it's in your prep maybe the deoxodine hasn't been neutralised properly.

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#11 _LH SLR 3300_

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Posted 29 April 2011 - 08:58 PM

One more point i might add, etch primer is very porous as it's designed to "soak" in the primer, so naturally it'll soak moisture easily therefore i wouldn't advise leaving any etch primed panels for very long without applying primer. If left for more than a couple of days, it is adviseable to lightly scuff the etch primer with scotchbrite for maximum adhesion. JMO.

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#12 71xu1

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Posted 29 April 2011 - 09:15 PM

If you have mechanically stripped a panel there is no need for deoxodine it can be more trouble than it is worth like you are finding Ben. If you are using an etch such as Watyl Super etch it conntains phosporic acid the proper name for deoxodine so that invisible rust that sets in straight away is treated when you apply the etch, Obviously the etch should be applied ASAP. The only time I use deoxodine is if I have used paint stripper and have neutralised the paint stripper with water. LH SLR 3300 is on the money whenever I use deoxodine I alwyas run the wizzer over the panel with either 180 or 240 grit depending on my mood to get rid of that nasty film deoxodine leaves and to provide a key. Again know you product Super etch or Altra etch both 1K products there is others as well can be left up to three months uncovered without a problem of corrosion. They suggest then all you need to do is recoat for continued protection. Etch is actually designed to soak into the metal.

Cheers Dave

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#13 _TUFF75LH355_

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Posted 30 April 2011 - 04:03 PM

im using k & H 1k etch primer 71xu1

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#14 _Bomber Watson_

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Posted 30 April 2011 - 04:14 PM

Thats probably your first problem.

Why on earth did you buy paint from Autobarn??

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#15 _TUFF75LH355_

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Posted 30 April 2011 - 04:35 PM

didnt buy it bomber got a mate that works there so he got me some for nothing

what brand primer, deoxidiser, stripper, paint etc should i use..?? like whats good cheers ben

Appreciate the help heaps too guys

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#16 _Bomber Watson_

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Posted 30 April 2011 - 04:40 PM

Aha cool.

Generally i would say Protec, but i dont like Protecs 1k etch very much.

That said a very very light coat then either there primer filler or primer surfacer over it seems to work well, generally i skip the etch and just use Primer filler if im playing with Acrylic in Protec.

Have used the Wattle super etch as 71 XU-1 mentioned and didnt mind it. Definitely seemed better than the Protec stuff.

Have never used Wattle automotive top coats so cant comment.

Phosphoric acid i usually just use Septone.

Stripper i like GPI Automotive paint stripper.

Edited by Bomber Watson, 30 April 2011 - 04:40 PM.

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#17 _TUFF75LH355_

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Posted 30 April 2011 - 05:50 PM

If i use Protech products can I skip etch and just give the bare metal panel a light coat of primer filler or not. If I use Protech primers and topcoat in acrylic but use wattyl etch with 1 light coat on top of the bare metal just to cover it while I do my repairs and filling

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#18 _Bomber Watson_

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Posted 30 April 2011 - 05:57 PM

Yes if you use Protec primers you can just use Primer filler over the bare metal.

I cant see why Protec primer filler wouldnt work over Wattle super etch.

Im not sure if you can use Bog over Wattle super etch, never tried.

Cheers.

Edited by Bomber Watson, 30 April 2011 - 05:58 PM.

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#19 71xu1

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Posted 30 April 2011 - 10:27 PM

Whatever you do don not use bog over any 1k etch the bog will just peel off. The only time I use etch is if I am doing repairs and need to cover them to prevent corossion whilst I am doing the rest of the repairs or the car is going back on the road with primer patches etch underneath to stop the corossion. Technically u should use etch but none of the shops I have worked have bothered unless the car has been stripped to bare metal and the next stop is the panelshop. I k primer sticks pretty well to bare metal. But if you are doing your car bit by bit etch it as you go. Wattyl automotive coatings is or was called Spartan paints not bad stuff.

Hope this helps.

Ps any acrylic 1k primer will work over Wattyl super etch actually you can even use super etch as primer but not a primer filler.

Edited by 71xu1, 30 April 2011 - 10:29 PM.