Well -failing the fishing out of seeds out of the seed compost, the next very best thing you can do if they are in little seperate pots -just put the individual pots into a plastic food bag and screw the bottom round to seal it so that the top skin is fairly tight accross the top, after one day heavy condensation will form on the top skin , its the same with seed trays-all you can do is tightly wrap them in saren wrap, or place the whole thing into a large clear plastic bag the same size as the seed tray and seal the end with an elastic band or tie,
Those two methods work nearly as good, and will quickly aid germination even up to the three week stage after the plastic bags have been put on.
