it is hard, if not next to impossible, to get polyester gel to stick to epoxy. try doing a polyester repair. that is what the boat was built with in the first place.
<br> seeing the colour of the epoxy through the gel means that the gel is too thin or there is not enough pigment in the gel to start with.
<br> adding epoxy pigment to epoxy should not harm the matrix, but i doubt it will give you the result you want.<br><br>