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Not to get ahead of oneself, but before you even decide how to apply gelcoat, and whether to use a spray applicator, a tongue depressor, or your own finger, you need to understand that there is no formula for the light blue interior gelcoat color. When Fisher-Pierce, Co. mixed the light blue gelcoat, it was done by a factory worker, not a machine or computer. Essentially, they took benzoil peroxide (BPO) and dimethylaniline (DMA) and mixed to a light blue color. BPO was the yellow and DMA was the blue; too much BPO and the gelcoat would not cure; too much DMA, and the mix was teal/green. Today we can use a coloring agent such as Evercoat marine coloring agent Blue, production number 100-507. It is a trial and error process to perfectly match your BW16 interior gelcoat color. It is not difficult. You just need to be patient, and willing to get your hands dirty.