how to repair cracked wall mount panel heater?

I have a wall cracked wall mounted panel heater. One kid pushed another into it and cracked not broken but cracked all the way down the middle. Wanted to know if there is some kind of glue or somethng to put on it to where it can still be used. Please help somebody. I live with my mother in law and she does not know. Please specify a known store if any thing to buy to repair .ASAP