If the paint got the buttons stuck you can usually break them free by pressing the buttons in and breaking the paint. If the paint is really thick then you can use an x-acto blade To break up the paint sticking the button. Those two methods worked for me - but in a worse case scenario you may be able to get away with applying paint stripper with a q-tip to the button very delicately - depending on if your camera has o-rings on the buttons To keep the camera water resistant.
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