See if these help you out.

https://lifehacker.com/completely-make-over-vinyl-or-laminate-floors-with-pain-5977820

https://www.homeflooringpros.com/blog-guides/can-you-paint-laminate-flooring

Hi Leona, hope these help you

https://www.youtube.com/watch?v=a-OyxRQgrG8

This is long but worth the watch

https://www.youtube.com/watch?v=X-v5XJ2y57A

I would check with the manufacturer. But, you probably can, since most laminate flooring can be painted with careful prep. It sounds like a floating floor (not glued down), which is where you are getting separation. The filler would probably crack as the floor shifts.

Here's a post that might help - https://www.lisascreativedesigns.com/how-to-paint-a-laminate-floor/

https://www.hometalk.com/1433767/diy-painting-old-laminate-floors-beforeandafter

https://www.hometalk.com/34975600/paint-your-wood-laminate-floor

DIY Painting Old Laminate Floors #BeforeandAfter

Laminate Wood Floor Makeover - PAINTED!

I used Durham putty in my floor cracks. It comes in a powder, just add water to the consistency you desire.