Eventually you will need to go with a better cage with bar spacing 1/2 inch or less.
What type of mesh did you use?
Many folks use a plastic hardware cloth sold at Lowe's or Home Depot in the garden section with the fencing to build their own cages. (also called Landware) It is a very thick plastic with 1/2 inch square holes.
If you are using a thinner plastic, such as material designed to keep deer or rabbits out of a garden, that gliders can chew easily, you might try the Landware and see if it works.
Be careful adding mesh to a wire cage. It needs to be attached INSIDE the cage to prevent the gliders from going between the bars and getting trapped between the bars and the mesh. It should be zip tied tightly in numerous locations all over the cage. The cut ends of the zip ties need to be either burned or filed down to make sure there are no sharp points that gliders (Or people) can get cut on.
In addition - the plastic mesh combined with the wires creates many points of contact where glider pee, pooh and food waste can accumulate making the cage very difficult to clean.
Getting a glider safe cage would save you a lot of time and trouble in the long run.