Although some details and ...

First of all, first thing to know, this "undyed" gel appears white in the tube but when applied it is quite transparent. It can be used on an existing painting, to make phosphorescent at night.

Moreover, the effect is present, but light enough if one application is made. I recommend applying at least 3 layers (pending drying between coats).

Finally, note that mixed with another painting, this gel is almost inopérent, or it will at least respect basic 60/70% gel for 40/30% of paint.

(For information, in my case, the gel was applied to an existing paint in the bedroom of my child, to reveal some elements at night).