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If you leave the first layer to fully cure then, yes a key with sandpaper will be best to achieve best adhesion. If you allow the part to only cure until it is firm but tacky (when the resin sticks to a gloved finger but no longer stays on the glove), then you will not need to key the resin and can pour directly on top.
You will need some form of mould edge as the resin would otherwise just flow over the side onto the floor and continue flowing until very little is left. With a decent border to it, once cured you will have a nice solid edge that can be shaped as required then polished back up to a high gloss finish.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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