You do know that air can hold only so much H2O as a function of its temperature. The air above the ocean cannot have water added to it by spray unless it has not already absorbed all the moisture that it can hold. Most likely the air is already saturated over a body of water like the ocean.
The air above the ocean varies from dry to thunder clouds. Of course, it is more humid on average. But half the time we can increase the humidity that blows from the Pacific over California.
A second solution is to pipe that ocean water inland to a desert basin, then create the spray.... and a new salt water lake. But that would help AZ and NV more than CA.
How are those de-salination projects going. To water the forest we don’t need drinking taste purity level de-salination. 90% de-salination is a lot cheaper than 95% which is a lot cheaper than 99% which is a lot cheaper that 99.9%. What level can the trees handle?
I’m from WA. The humidty/fog/drizzle is salty several miles inland and the forests grow just fine.