can this be applied over nail polish?

It won't do anything for your nails if you apply it over polish. You need bare nails for it to sink in and do its job. You COULD apply it over nail polish but it would just be an oily layer and a waste of the product.

how do you get the pen to work?

It’s hard to tell when you’ve done it right, but I just kept twisting and twisting until tiny drops eventually cane out onto the bristles. It’s very controlled some how and must have an inner seal that breaks if you turn it hard enough.

how long does a pen last?

Of course, this depends in use. IMO, they last a long time.

Can I use this along with other nail strengthening products?

I don't think you need to' they work differently. This product is like an oil and other nail hardeners are more like a polish. I had powder gell nails on for a long time. Once salons closed down, I had to bite the bullet. I took off the gel and my nails were very week underneath. I use Cel all over my nails daily and it seems to stop the peeling and makes them stronger. I apply Cel, let sit a minute or two and then rub it in to each nail and cuticle. I don't think you can do this if you have another hardener coating the nail. But you can still use it on the cuticle. My nails are really looking nice at this point . . . not sure I will go back to dip manicures at all. Hope this is helpful.

Manufacturer	Guangzhou Beaver Cosmetics Co., Ltd
Item model number	CNP001
Product Dimensions	12.95 x 3.05 x 1.52 cm; 100 g
ASIN	B07YSNXJ93

cel

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