AFTER Applying the Solution, We Wait Until Its Not Dry Out Completly. The We Carefully Remove the Established Rules and See the Perfect Angle. At the Same Time, There is no Need to Buy Special Corners. We Make the Upper Slope as Well as the Side, from the Right Corner We Add 2-3 Centers and Draw Two Lines On the Left and Right Slopes. According to these Lines and Level, We Horizontally Set the Rule and Fasten it to the Wall. We Do EVERYTHING Too AS with Lateral Slopes. The Apply the Solution, and Again Align with a Spatula. We Are Waiting for Complete Drying, and Remove the Rule. After the Work Done, Take The Grater and Grind the Applied Solution. Well, That’s All, IT Remains Only to Paint with Water -BASED PAINT.