If the coving is already on the wall and there is no option to stick an aluminium tape then you can paint the entire coving with a coat of darker colour (such as dark grey) and then paint the coving with the desired coat.
It is important however that you use a colour dark enough that will block the light but not too dark so it would not affect the final colour.
It might be a good idea to test this technique on an off-cut first to make sure that the dark paint is not too dark or too light.
Alternatively, as a safer option, you can add a couple more coats of paint (until the light does not shine through) and it might do the job depending on what paint are you using and how much paint you apply.
Please remember however that we recommend only water-based paint. Any solvent in the paint might damage the coving.
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