Would it be ok to do this just for one show?

i am thinking of switching to hunt seat (i ride saddle seat currently) i have almost everything i have tall boots (that are broken, i put them on consignment but the tack shop can't prove that the zipper got broken on consignment) and i can't get to a shoe repair until monday to see if they will actually fix them, and if they can't i have to drive out to the tack shop where i got them from to send them back to be fixed (my other boot got chewed by my dog so that is how i know that most shoe repairs will not fix them) i might have a saddle that i can borrow every now and then, i just need to get new breeches (my mom dripped bleach on the butt of them while she was washing them so now they have a bleach stain on the butt) and a dicky but i have a coat. but my real question is i have rubber boots that i bought from target a while ago, they are black but have polka dots on them. would it work if i spray painted them black and wore them for one show? or until i get my boots back from the shoe repair? we have possibly 2 shows before fair. and i would hope that i would have them back before fair