Crispy crispy biscuits...

To retain the crispiness of biscuits for long time after its cover is opened, just put it in a plastic container and keep in refrigerator. The biscuits will not lose its crispiness for a long time. 

An additional use of nail polish remover.

Fevi quick/quick fix is a very strong adhesive, so we should be very careful while working with it. Once it is applied on our hands accidentally, and the fingers are sticked,  it is so hard to take out. 
Nail polish remover is a good remedy for it. Apply some remover on the affected area. It will melt the gum easily. So always keep some nail polish remover aside, while working with  quick fix/fevi quick.