I skinned one part and am having problems with the second layer of epoxy resin.

The steps were as follows:

1 - Sanding of the piece with grain 120

2 - Epoxy resin base

3 - After 2h30 I put the carbon fiber and left it overnight

4 - First layer of epoxy resin

5 - After curing, I sanded the first layer to remove imperfections

6 - Second layer of epoxy resin

7 - After curing I went to sand again with grain 120

And then the problem started to appear, the second layer started to peel to the level of being able to remove the entire second layer with a spatula.

Because the night was cold, it took more than a day and a half for me to sand.

Where can I go wrong?