Comments about Celestron Celestron Astro Solar Filter for Nextstar 5, NexStar 130 SLT, Astromaster 130mm:

The filter works, no question about that. When the filter is on the scope, aimed at the sun, the filter gets of course warm. This will soften the glue that holds the foil to the ring. There is no reinforcement on the back of the ring to hold the filter in place. Once the glue lets go of the foil, it will flap in the wind and can potentially expose the eye to direct sunlight. This is very dangerous, and I have a hard time recommending this filter to anybody.

Once the foil is pressed on the ring again, the glue will stick again. The question is just for how long.

Celestron either has to use a different adhesive, or reinforce the foil on the back so that the filter stays in place even if some of the glue comes off.