With the pen knife and scribing pen, you can first use the back of the pen knife or the scribing pen to outline the colored parts, that is, carve a groove on the part along the position that needs to be colored, so that there is more The color will stay in the groove and will not overflow. Also, when using the marker pen, if you are not painting a large area, do not press the pen tip too many times, otherwise there will be too much paint and no method can save you if it accidentally overflows. , then after the paint is completely dry, you can use a pen knife to scrape off the overflowing paint. It will not damage the parts, and it will be flat and the effect will be good. It is recommended to use this Gundam-specific coloring pen