I filled the Sea 2 layer with white. For layer styles, I went to Color Overlay, left blend mode set to Overlay, and selected the same neutral gray [128,128,128] color. I left the opacity at 100%.
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Name:	06 Sea 2 Color Overlay.png 
Views:	72 
Size:	49.0 KB 
ID:	22488 (Color Overlay dialog)
Then I went to Pattern Overlay, left the blend mode at Normal, left opacity set to 100% and reduced the scale to 35%. I selected a lighter stock texture that Photoshop came with.
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Name:	07 Sea 2 Pattern Overlay.png 
Views:	76 
Size:	59.9 KB 
ID:	22487 (Pattern Overlay dialog)
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Name:	08 Sea 2 over Sea 1 and Sea base.png 
Views:	62 
Size:	221.6 KB 
ID:	22489 (resulting image)