Etching masking tape?

[stefanbuss]

Dear Friends,


here are two photos of my current DFW. The wings were masked for about three weeks to work on the walkways. I know, three weeks is rather long, but i have to use a room without heating for my airbrushing jobs, and even yesterday, it being a rather warmish day, it was challenging to airbrush at +4°C...

Anyway, removing the masking tape (which was a Tamiya one, no cheap replacements), i discovered those rather canyon-like marks on the wing. i assume this was caused by the masking tape itself, but i would like to understand the causes.

The wings' undersides were masked as well for painting some hatches, there are no issues at all.

If this was caused by the masking tape, why did this happen only at the areas i have highlighted for your viewing pleasure? The masking tape had bee applied to the full wing...What has happened here, and why?

Right wing


Left wing



Ideas, anyone?

Stefan

[Kai]

Was the same paint on the underside?

[uncletony]

Erm, what kind of paint are you using and what are you thinning it with?

[stefanbuss]

On top: Gunze paint, thinned with Tamiya acrylic thinner (white cap).
Below: Vallejo Air, thinned with Vallejo Thinner.

The damage looks melted, rather than lifted by tape.

Exactly.

[uncletony]

Well, you are getting a lot of orange peel, so I would be suspicious of the Tamiya thinner with the Gunze acrylic -- it's either not thinned correctly or you are spraying at too low a pressure. It could be that the thinner and the paint are not actually completely mixing and you are getting droplets of pure thinner that are then seeping under the tape? Just a theory.

[coyotemagic]

... you are getting droplets of pure thinner that are then seeping under the tape? Just a theory.

Yep.  My theory, as well.
Cheers,
Bud