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We studied the dynamics of water sessile droplets advancing on hydrophobic and visco-elastic Poly(styrene-butadiene-styrene)(SBS)-paraffin gel substrates at various inflation rates. During the advancing process, the droplet contact line exhibits three different regimes of motions. When the contact line advances at a high velocity, the contact line moves continuously with a constant contact angle. As the contact line slows down, it starts stick-slip motion: the contact line is pinned at adoi:10.1039/c2sm26714d fatcat:sjjsejoysvc7dmfrdfvcyd5xku