Hey there..
Sgel is a hard gel to get right. I find if you dont apply enough it doesnt set even. If you apply to little it simply wipes off in areas, practice makes perfect when it comes to Sgel.. It doesn't self level as quick as clear gel, so I found if I applied a small ball of gel to the brush pop that in the centre of the nail then push up and pull down and take the remainder to the sides, then left that hand whilst I painted the other ( I found that it needed that extra time to level itself out and become even) when I came back to the first hand it was even ... If not I knew where to apply more/less gel. Then set for two minutes and wipe with dual cleanser..
However I have now personally stopped using SGEL as we found it was strong when on but difficult to remove!