What is the best way to blend the cut lap when doing a resin tint without fading the color?

For a continuous color deck and bottom make a "master batch" of resin with the color in it. 

Pour half into a clean container and put a lid on it. 

Mix the hardener in the first bucket of resin and laminate the bottom - 1 layer of glass. Cut lap that on the deck.

Then mix hardener in the second color resin bucket and laminate the deck - 1 later. Cut that at the bottom cut lap. 

Then laminate the bottom clear free lap - sand the lap flush with deck

Then laminate the deck clear free lap - sand the lap flush with bottom