Dynamic paint not fading on render

Hey all,

just started using Blender recently and it’s great, i’ve managed to scour the net for most of my answers but this one has me stumped


basically the preview window shows the dynamic paint as i want it (more or less), but the rendered version is not the same, its not fading like it should, it just accumulates into one large block

Blender noob hoping for some sage like Guru advice :slight_smile: