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PostPosted: Thu 15 Sep 2016 13:03 pm 
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Yep, I forgot to give it a wash to remove and chemicals before giving it a coat of primer, with the result that there is a very spotty covering and paint doesn't want to adhere. Idiotic beginners mistake aside, what's the best way to correct this? Is it too late to give it a clean? Should I give it another hit of primer and hope for the best? Should I soak it in white spirit to try and remove the enamel primer and pretend it didn't happen? Should I hang my head in shame and carefully pack the kit away in the wardrobe, never to see the light of day again? Are there any better solutions?

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PostPosted: Thu 15 Sep 2016 13:41 pm 
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Fascinating. You're certain that this problem has something to do with not washing the model? Is it one of those old Soviet kits with a coat of fuel oil on it? Just sand it down a bit, give it a dip in some warm water with a bit of detergent, then let it dry and press on-- but I have my doubts about lack of washing being the cause of the problem. Could you post a photo? I hope this isn't some super-expensive kit with a ton of after-market inside. On the other hand, the Modeller's Law dictates that it must be.

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PostPosted: Thu 15 Sep 2016 19:15 pm 
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I concur with Dancho, but I have never washed my kits, and only got caught out a couple of times with Resin kits.
Mike


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PostPosted: Thu 15 Sep 2016 19:54 pm 
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MattNSW wrote:
before giving it a coat of primer, with the result that there is a very spotty covering and paint doesn't want to adhere.

Depends on what type of paint you have used.
As the others have said, I´ve ever washed kits, figs etc. I have had some pooling of paint on large surfaces in the past (beginners mistake) but as soon as it happened I rubbed/dabbed the paint off with some toilet paper. The paint was too thin and I re-painted with slightly thicker paint. I use acrylics so removing it was no Problem.

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PostPosted: Fri 16 Sep 2016 04:28 am 
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Hm, I tried taking a pic with my phone but the focus is too blurry - it looks as if I'd put paint on a waxed surface. It's a bog standard Airfix 1/48 Mosquito with Tamiya spray primer and Humbrol acrylics - nothing arcane. I assumed it was the lack of washing as it's the primer coat which is affected (across about a quarter of the sprayed area) and manufacturing residue was the first thing that came to mind. I put some matt black on the instrument panel to see how it'd affect it and it basically comes off as with a scratch card, but a lot easier.

I'll give it a soak and recoat it, see what happens.

(I've never heard of it before, but I'm not sure I like the sound of "Modeller's Law")

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PostPosted: Fri 16 Sep 2016 05:41 am 
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Wash it. Rub over the paint already on with toothpaste, either on your fingers or a soft cloth. Go easy. Use plenty of water. The mild abrasive will even out the fish-eyes and remove the paint where its not really adhering.
Do not soak in white spirit; this will ruin the plastic.
I too normally never wash standard kits, only the occasional resin kit or parts. However, my kits do get a wash as I wet sand all the joints
It may not have been oils from the initial moulding but oils from your hands. Sometimes whilst building, especially in warm weather, I find I need to wash my hands.

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PostPosted: Fri 16 Sep 2016 15:26 pm 
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Never heard the trick with toothpaste. I´ve got a model that I´ve been meaning to re-paint but couldn´t come up with any ideas of removing/smoothing the paintjob (acrylics) ..the toothpaste idea sounds like the solution :thumb:

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PostPosted: Fri 16 Sep 2016 16:33 pm 
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Toothpaste is a mild abrasive - stands in for rubbing compound, but if you've any of the latter it's better, because it doesn't foam. Toothpaste needs a good drench to clean up out of nooks and crannies. I too seldom wash kits 'on the sprue' but I do wash/wipe thoroughly after wet sanding, and once I have a clean surface I only hold it with cotton gloves (my hands are naturally oily too). I have also had occasional problems with Tamiya primer not taking, or bubbling in places, which is why I prefer the range of Mr Surfacer products (despite the stupid name). Personally, unless there's a mixture of plastic and resin surfaces I'd ignore the primer and get straight on with the colour coat, bearing in mind acrylics don't have tremendous 'grab' anyway, so you need to treat them gently until fully cured.

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PostPosted: Fri 16 Sep 2016 22:45 pm 
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Thanks for the tips guys. I would never thought of the sweaty hands, affecting the plastic, (in summer here, even with Air Conditioning, they do). Of coarse the Tooth Paste trick works, (thanks to who-ever posted that).
Mike


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PostPosted: Sat 17 Sep 2016 04:45 am 
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If I'm at all worried that handling might cause a problem due to natural skin oils getting on the plastic, I give the areas whjere I've been holding it like wings & fuselage sides a swab down with meths (rubbing alcohol) on a piece of paper towel, seems to work OK. Do this before any painting as the alcohol is bad news for acrylic paints.
Steve.

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PostPosted: Sat 17 Sep 2016 09:08 am 
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I haven't tried painting Humbrol acrylics onto Tamiya paints yet but at times I've discovered that some brands doesn't like to adhere onto others. Don't know if thats the problem here.

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PostPosted: Sat 17 Sep 2016 09:48 am 
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I agree with Carsten. If the primer went on OK then its a reaction between the Humbrol acrylics and the Tamiya primer (which IIRC is alcohol based) :idea:

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PostPosted: Sat 17 Sep 2016 15:00 pm 
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I always use Tamiya primer under Humbrol acrylics. Never had a problem.

Johnnyb

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PostPosted: Sun 18 Sep 2016 11:46 am 
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I gave the kit a wash and gave it the toothpaste treatment - first impressions suggest it's done the trick. It could well be that something was transferred from my hands onto the kit, it's difficult to see another reason if nobody else has had the issue before. So note to self - wash hands in future.

Thanks for the tips.

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PostPosted: Sun 18 Sep 2016 15:00 pm 
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Ratch wrote:
I agree with Carsten. If the primer went on OK then its a reaction between the Humbrol acrylics and the Tamiya primer (which IIRC is alcohol based) :idea:
Reading through the problem again; it was the Tamiya primer giving fish-eyes on the bare plastic which was the problem

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