If you're planning to seal dozens of invitations - then using a sealing wax glue gun with sealing wax sticks is the quickest - cleanest and most efficient method.
Glue Gun Wax Sealing Kit
GLUE GUN SEALING WAX
Gold Sealing Wax Sticks
Sealing Wax Sticks Pieces Of Wax Sealing Sticks Glue Gun - Temu Canada
Sealing Wax Candles and Glue Gun Sticks
Hot Glue Wax Seals Project
16Pcs Vintage Gold golden color Sealing Seal Wax Sticks Wicks For Postage Letter Classic wax seal Stick Hot Glue Gun for stamp
9ct Gold Pearl Sealing Wax Sticks for 7mm Glue Gun
VARACL 10PCS Sealing Wax Sticks for Letter Vintage Wax Seal Stamp, Glue Gun Seal Wax for Wedding Invitations Envelopes Greeting Gift Cards, with A Metallic Gold Wax Seal Pen (Antique Gold)
Sparkling Dark Green Sealing Wax