What brand paint ? Once got some paint that bubbled as it dried, this was in 1to1 scale.smason2 wrote:Hi Bernie,
This is a very timely topic. As Dave Frary mentioned, he and I have worked on several projects where this has become a problem. I noticed on Jimmy Deignan's layout on Saturday, that the area of water that I replaced with Mod Podge is starting to bubble again. Same thing...Mod Podge over acrylic craft paint. My guess is that it's the craft paint that is causing the trouble, as this is the constant that occurs through all the water Dave and I have done. I could be that the paint is off-gassing over time, or that it is reacting to the change in temperature/humidity. Perhaps, because it is still somewhat porous, the sub-surface is causing the problem.
Dave and I talked about this yesterday, and he mentioned that he was going to do some additional experimentation.
alkemscalemodels wrote:The problem with experimenting is that the problem, at least in my case, took several years to develop. I am not sure how one could accelerate the process.
I have not have problems with Liqutex Gloss Acrylic, so I think I would use that in the future.
As far as acrylic paints go, I have never seen any acrylic paint bubble. It is supposed to be designed for long term stability for use in art works.
I suspect that the foam insulation board I used under the water surface might be the source of the bubbles, but I really don't know.
Night Train wrote:Oil colors on the other hand use pigments derived from organic and rare earth compounds. I may try oil colors and see what happens.
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