Q: Is it advisable to leave sheet masks on the face or eye area overnight even though the directions usually instruct you to remove them after 15 to 30 minutes? Should these masks be used before or after other steps in my skincare routine?

A: Jean-Luc Bun, skincare consultant for Australian brand Skinvitals, says that the effectiveness of sheet masks depends very much on the serum that gives them their moist texture.

'In most instances, the mask is thin and has limited serum content. Therefore, the mask tends to dry out within 15 to 20 minutes,' he explains. 'So leaving the mask on the face overnight does not necessarily provide additional benefits.'

There are thicker masks containing more serum which should be left on for a slightly longer time, such as Skinvitals Cloth Treatment Masks (from $4.95, from Watsons and selected department stores).

'Its thickness allows it to hold more nourishing and active cosmeceutical serum and release it to the skin without wastage, enhancing the absorption of vital nutrients,' says Bun.

As for how it should fit into your skincare routine, Bun advises that a sheet mask be used after proper cleansing and exfoliation for better absorption and results.

'Upon removing the mask, any excess serum can be massaged into the skin. Follow this with the rest of your usual skincare steps,' he says.

Personally, I find using moisturisers and serums that come in jars or bottles a little less messy. Just pump or scoop the desired amount, smooth over your face and, voila, you are all set.

Clay and cream masks, such as Origins' Clear Improvement ($43, from all Origins counters), are messier when it comes to application but they cover your face more thoroughly and work more effectively.

However, sheet masks are great for travelling. They are light and will not take up much space in your luggage, plus you can get around those pesky airport guidelines on carrying fluids and gels.

This article was first published in Urban, The Straits Times.