solid tires

[bv bikes]

I have a 12" bike and it has solid tires and both the front and back both have a single crack how do i fill it in???

 

[gcrank1]

For show?
Your auto parts place, and many hardware stores and building centers have a black RTV 'rubber in a tube' product, If applied carefully you can make things look pretty good (also works on black cable housings where the plastic coating is pulled/worn off)