My chair has a crack in what was probably a fold in the material. The crack is about 2 inches long. How do keep it from getting larger
Would applying clear nail polish work?
Get yourself down to Halfords and buy a puncture repair kit, the type that includes parts to repair PVC inflatables as well as tyres.
They include a clear patch that should do the job.
Make sure the area is clean and dry before you repair.