I need to mount puck lights to glass shelves. Mounting tape & velcro won't work, the lights fall off. Ideas?
Adhesives.
Gorilla glue will hold it, but you may never get it off again.
You could try some white glue first to see if it will hold. If it does work, great. If it doesn't, the clean up is easy.
A look at what is currently available on eBay
 1 inch 5 yards Self Adhesive Velcro Hook and Loop Tape US $.01 
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 5 yard Black sew on Velcro Hook & Loop Tape roll 1 Inch US $.79
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 Black Self Adhesive Velcro 1" wide Hook Loop Tape 6ft US $5.75
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 1 inch 5 yards sew-on Velcro Hook and Loop Tape CV002 US $.99
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 5 yards 2 inch Sew-On Velcro Hook & Loop Tape White US $.99
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 5 yards 1 inch Sew-On Velcro Hook & Loop Tape Black US $.99
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 1" Self-adhesive Velcro Hook Loop Tape Strip 1M BLACK US $.01
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 1" Sew On Velcro Tape Roll Hook & Loop Craft (1+1) yard US $.77
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 2x Velcro Sticky Back Tape Strip WHITE STRIPS 18" x 3/4" EACH US $7.99
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 1 inch 5 yards Sew-on Velcro Hook + Loop Tape Crafts US $.77
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 1 inch 5 yards sew-on Velcro Hook and Loop Tape CV008 US $.99
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 5 yards 2 inch Sew-On Velcro Hook & Loop Tape Black US $.99
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 8 EIGHT 3M VELCRO TAPE DUAL LOCK EZ PASS I PASS HOLDER US $3.65
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 VELCRO STRAPS - STOP BUYING HOCKEY TAPE - USE VELCRO STRAPS - US $13.00
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 VELCRO STICKY BACK TAPE - 3/4"X15' -# 90081 - BLACK US $18.65
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