Don't panic wylie I am here,
Silicone is a pain in the bum to say the least,
However remove as much as you can using blade, orbital sander or by any means possible.
When you are happy you have got most of it off,just apply a coat of oil based undercoat on the areas the silicone were,
The acrylic paint will then stick.
If you have an area where silicone has been applied,for example the top of tiles,no more gaps over it and letting it dry will enable painting successfully.