How To Fill Cracks In Window Frame

My sleeping accommodation window has a small crack around the bottom where the UPVC meets the plaster windowsill.
It is letting in a slight draught. There is too some mould coming.

How tin I fix this? I am a total DIY newbie. Do I just put down some silicone sealant along the crack? Or does the plaster have to be redone?
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Scrape out the loose stuff and run a bead of sealant along you would do better to use an Acrylic paintable sealant rather than silicone as when redecorating you will have trouble with painting the silicone, it's like trying to pigment a non stick pan!
If you are new to it use a proficient quality masking tape smooth with a wet finger (employ h2o with the tiniest drip of washing up liquid in information technology ) then remove the tape and if you feel dauntless exercise a final very calorie-free smoothen with a wet finger cleaning off whatever sealant on your finger and dipping it in the water before each stroke.
When it looks xc% correct go out information technology at that 'cos you will only mess information technology up if y'all keep fiddling with it!
Thanks.
I take been doing a lot of silicone sealant around shower units etc although I am nonetheless quite messy and poor at it. I take the removal/use tool only I dont similar to use it, I found information technology easier to utilise stanley knife to remove and wet finger to utilise.

Will get some acrylic sealant tonight and accept a bash at it unless there are other comments.

I have this problem in other areas too, for case in tiled bathroom. Can I utilise the acrylic sealant for where UPVC joins tile or would silicone be amend for that?
In the bath between tile and UPVC I would go with silicone, ideally one that is anti mould.
Wipes are actually good for getting silicone off your hands and things yous didn't want to silicone!
http://www.screwfix.com/p/de-solv-it-multi-chore-wipes-pack-of-100/68969

or

http://world wide web.screwfix.com/p/big-wipes-industrial-cleaning-wipes-yellow-pack-of-120/6437f
awesome thanks.
yes i learnt after the start cataclysm to accept various tissue and newspaper bachelor to wipe and dispose of things. Will await into the wipes although I establish kitchen roll was plenty to wipe off the sealant last fourth dimension.

Is it worth using the tool to apply?
Lots of people rave about the tools, I have tried them and always stop up with the marking one finger!
I guess they work OK if information technology is a straight run with no tile joints etc, like the demos on TV where they accept two bits of melamine joined at 90deg, but get to a corner or behind a tap and they merely don't work.
They tin can also leave an invisible picture on the wall above that merely shows up as it gets wiped or dingy.

In fact I had 10 metres of worktop to seal on Fri 6 internal corners, 5 external corners and of form the sink mixers to go behind. I thought I will endeavor some tools that had skilful reviews on screwfix, chucked information technology back in the tool box subsequently half a metre!

Skilful masking tape similar Frogtape is worth buying too.

Go on information technology simple!
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