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Posted

After a couple of light coats with the airbrush, seam lines and holes clearly appeared on my external tanks.

So, I applied some Vallejo putty and then sanded with 800 and 2000.

 

As you can see in the photo, sanding completely removed the paint.

Is this normal? I didn't use a primer.

 

Thanks for your valuable advice!

 

IPYLnY.jpg

 

Posted

It is completely normal, but a bit annoying. It would have done it even if you’d primed it, but priming does improve adhesion. Sanding is pretty destructive anyway, but adding primer first allows you to see any blemishes that you might have missed, so even if you don’t see any other use for it, there’s that one :) 

Posted

Hi.

 

Yes, it is.

 

The thickness of an airbrushed modelling paint is usually no more than a few microns, so any sanding with a grit less than 1500 or 2000, or that is not gentle with these grits, will reach the plastic.

 

As Mike says, the primer helps to see the imperfections, although I am not a big fan of it because it adds layers. I prefer a light coat of light grey paint on the area to be inspected, since once its mission is fulfilled, it can be easily removed with alcohol and thus no extra layers need to be added.

 

By the way, I do not recommend Vallejo putty because I consider that it does not have the proper grip or hardness similar to plastic. In my opinion, the best putty is black cyanoacrylate or, failing that, the traditional one from Tamiya or Gunze.

 

Andrés.

Posted

For me the Vallejo acrylic putty has a use especially where a canopy doesn’t quite fit leaving small gaps. Since the putty doesn’t etch itself into the plastic, there is no danger to the surrounding parts and any excess can be wiped off with a damp Q-tip (ear bud).

  • Agree 1
Posted
1 hour ago, Chuck1945 said:

For me the Vallejo acrylic putty has a use especially where a canopy doesn’t quite fit leaving small gaps. Since the putty doesn’t etch itself into the plastic, there is no danger to the surrounding parts and any excess can be wiped off with a damp Q-tip (ear bud).

 

I couldn't have described it better myself.

 

Andrés.

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