Bald Spot Concealers
A: I, personally, can see some "possible" situations in which bald spot concealers would be appropriate. However, these are very limited and none of them involve up-close-and-personal interaction.
These bald spot concealers work by coloring the scalp in the area of thin hair with a color that makes the bald spot appear less noticeable. Some formulas include fibers - either in the spray itself or as a second step application - that adhere to the existing hair and sort of "fill in" the hair, making it look thicker and fuller.
As mentioned earlier, the results are best viewed from a distance, since up-close inspection reveals the effect as what it is - a painted scalp.
Some people may be tempted to try the products, since they only average a cost of $10 (U.S. Dollars) but it should be pointed out that unless you plan to use the product for a theatrical production, you will basically be paying $10 for the chance to create an embarrassing look for yourself.
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See also:
Bald spot concealers
Hairstyles for balding men
Hairstyle to cover bald spots
Hair loss and camouflage methods for thinning hair