Plaster - Need to smooth it out but it's already dry

[Misc]

Hi, again - Another question if i may.

I routed wires behind the wall for the tv & my plastering skills show up very badly when i've got my neons on behind the tv. I've tried various sanding blocks/paper but the plaster doesn't seem to smooth down to the point where the bumps disappear. What can i do to get rid of them, obviously i don't want to spend much (much as in over a few quid)

Any ideas? Cheers.

https://img133.imageshack.us/img133/9296/image082mk6.jpg

[stinkwheel]

Could try polycell smoothover.

Like really thick, self-levelling paint.
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[Frost]

Use coarse sand paper in a power tool. It will level it out, but also scratch up the surface, then smooth it over with finer grit.

[bazza]

This should do the trick: https://tinyurl.com/5fh5au
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[Finglonga]

Best way is to sand it over and skim it again but make sure you don't use a float that is too small as the irregularities won't be covered properly.
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[Misc]

Cheers guys, i'll go for Stinkwheels method first, if not i'll have to go for the sanding on a power tool.