The short answer to this question of if grass paint washes off in the rain is no. Grass paint takes about 1 hour to dry and then after it is dried, it is basically waterproof and can withstand rain. You can and should also water water painted grass every once in awhile just to make sure that your grass doesn’t completely die.
That being said, painted grass still has a life expectancy of about 2-3 months in most cases depending on various factors that we discuss in this article.
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