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Depressing bodge up. Channels have ended up a as ravines. One of those situations where, to even it out, you sand more from the left side, then more from the right, then more from the left, etc resulting in this - and the final result is left channel 1/2" further out than the right. And it started off so well, did this from scratch with blocks of EPS got it perfectly symmetrical until deciding to experiment with channels. I did think about filling both channels with Polyfilla/spackle and just leaving the bottom flat but that'll probably add a shed load of weight. Or using the scrap bits of EPS to fill these up. What do you people reckon? Salvage or scrap? Cheers :-)