First, let me notice about source of this article How to repair damaged eyeshadow .
Lets try on this broken eyeshadow palette which has 2 damaged shadows.
Step 1. Break up blister with a pencil into dust.
Step 2. Apply alcohol on it from sprayer or dropper. Eyeshadow dust must be wet but without pools.
Step 3. Take coin of proper diameter and wrap it into dry clean fabric.
Step 4. Press it on eyeshadow during about 30 sec.
Step 5. Let it dry.
Step 6. Clean palette from dust.
Step 7. Repair second blister on this way. You see - it's almost new!:)
See before and after.