Do I need to add felt pads to the bottom of DIY coasters?

Yes, adding a grip layer underneath is what turns a craft piece into a finished product.

• Adhesive felt pads or cork bumpers protect furniture from scratches.
• They stop the coaster from sliding when a glass is lifted.
• Self-adhesive felt dots are inexpensive and take seconds to apply.

Place a pad near each corner, or a single ring for round coasters, so the base sits flat.