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Expanding foam can be bought from b&q or similar. Its around £5 a can. The filler on both bumpers is still fine and haven't sunk at all. Only a light skimming is used, just ensure you use proper plastic filler.
Oh and what do use to smooth the screw holes from the no. plate? you can't use the foam stuff on that can you? do you just use plastic filler for them? and for the boot badge do you just use normal filler?