wouldnt you have to replace coroplast often??

You probably should be using both. Coroplast for a tray and the fleece for the bedding. You can't really replace the fleece with coroplast. And coroplast is plastic, so it really shouldn't need replacing unless you redesign your cage and it doesn't fit anymore. Then you can either cut it or tape another piece to it to make it fit.

If you aren't using coroplast under your fleece, what are you using? Linoleum? Shower curtain? Can you post pics?

Coroplast, if kept clean, can last indefinitely. It's extremely durable, waterproof and easy to clean. It's basically corrugated (like cardboard) plastic.

TX_2_pigs...i am using wood under my fleece. but its to hard to keep up, so im switching.

I'd get rid of the wood because since you used nothing else between the fleece and the wood, the wood has absorbed all the urine and will be full of bacterias.

Coroplast is very durable, long lasting and easy to clean. Fleece wicks moisture to whatever is underneath it. But you will need something absorbable between the fleece and the coroplast such as many layers of newspaper, towels, mattress pad/crib pad, puppy pads, etc.

OK, so just build a tray of coroplast and put on top of your wood. And if you want to switch from using fleece you will have to switch to some other sort of bedding, like carefresh.