clover Fabric Folding Pen, Multi-Colour, 2.54 x 8.38 x 22.09 cm

I’m making bathing suits. Can I use this just to hold two slippery fabrics together where I want to seam?

What is the liquid in the pen? Is it toxic?

Is there any kind of odor at all to the liquid?

Has anyone used liquid starch in the pen?