Painting over egg/oil emulsion layers with pure egg tempera

[zarina]

I started painting several large panels last winter using 2-3 layers of egg/oil emulsion. However, since working with this mixture, I have recently gone back to using straight egg tempera as I prefer the simplicity & beauty of this technique. Is it safe to paint over my earlier egg/oil panels again with pure egg tempera? Or is there a risk of variable dyring times & cracking occurring? I have tried to sandpaper the layers down but the layers are pretty well cured (& the panels pretty large). I am also worried about potentially sanding down to the gesso layers. I would prefer to paint over the existing layers if possible.

[turlogh]

Is it safe to paint over my earlier egg/oil panels again with pure egg tempera?
I think you should finish the paintings with the same egg/oil emulsion they were started with. I would be quite worried about large areas painted with pure ET over emulsion.

[odyssic]

Because the pure tempera dries so quickly, it will crack almost immediately in any areas where the under layer is thicker.

Steven