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There are a few health warnings if you watch youtube.
The first is that most of the people demonstrating are fairly young.
This makes it much easier for them to apply products uniformly
You will see things like sweeping and wiping actions for spreading and blending.
Many of us are much older and these techniques don’t work as soon as your skin gets looser.
You will need more of a dabbing and stippling action and need softer brushes if you are to get a good result.
Otherwise, small folds will develop in your skin, and brushing across these will leave lines.