Almost every painting will encounter the problem of leaving blank space. How can I keep masking fluid from damaging the pen?
Prepare tools:
1.Masking fluid
2.Soap water
3.Watercolor pen/silicone pen
4.Glue residue eraser

Operation steps:
Firstly, use a slightly moist pen to smooth out the bristles with soap water.
Dip some masking liquid on it and paint it. It’s best paint all the areas that need to be left blank at once.
Wash each stroke after drawing, and replenish the soap on the tip when it runs out.
It should be naturally air dried.Otherwise it won’t be easy to erase!
After use, just wipe off with glue eraser. Do not use your fingers, otherwise the grease and dirt on your fingers will be printed on paper.
You can use a silicone pen instead of soap, it’s easy to clean and very cheap.
You can also use masking fluid pen, which is super convenient and can be directly squeezed out for use.
If you are afraid of not being able to see the location of the masking liquid, you can buy colored masking fluid.

Used it on my watercolor painting.It worked great ! Easy to remove.