How to Seal a Letter with Wax (and Mail It Without Damage)

The short answer: melt a small amount of sealing wax, pour a pool a little wider than your stamp head, wait a few seconds until the edges begin to set, then press the stamp straight down, hold it briefly and lift it straight up. To mail the letter within the US, pay the USPS nonmachinable surcharge. As of July 12, 2026, that makes a 1-ounce letter $1.31 instead of $0.82.

Below are the details: what you need, each step, how to fix the usual beginner problems, and how to mail a sealed envelope.

What you need

• A wax seal stamp. Most kits use a round metal head on a wooden or metal handle.
• Sealing wax, as sticks or as small beads.
• A melting spoon and a tea light candle, or another heat source made for sealing wax.
• A lighter or matches. Many kits leave these out, so check before you start.
• A heat-safe surface and some scrap paper for practice.

Our wax seal kits include the stamp, wax, a melting spoon and tea lights. For example, the Rose Wax Seal Kit comes with a wooden-handled stamp with a 1 in (2.5 cm) head, three wax sticks in gold, silver and burgundy, a stainless steel spoon and two tea lights. Lighters and matches are not included in our kits.

Step by step

1. Practice first. Make two or three seals on scrap paper before you seal a real letter. It takes a few tries to judge how much wax to use.
2. Set up safely. Work on a heat-safe surface, away from anything that can catch fire. Light the tea light.
3. Melt the wax. Put a small piece of wax stick, or a small scoop of wax beads, in the spoon. Hold the spoon over the flame until the wax is fully liquid.
4. Pour. Pour the wax onto the envelope flap in a small round pool, a little wider than the stamp head.
5. Wait a few seconds. Let the wax start to set at the edges. If you press too early, the wax sticks to the stamp; too late, and the design comes out shallow.
6. Press straight down. Press the stamp into the center of the pool with steady, even pressure. Don't twist or rock it.
7. Hold, then lift straight up. Hold for a moment, then lift the stamp straight up.
8. Let it cool completely before you move or stack the envelope.

Melted wax is hot and the candle is an open flame. Keep the kit away from children and never leave a lit candle unattended.

Fixing common problems

• The stamp sticks to the wax. Wait a few seconds longer before pressing, and keep the stamp face clean and dry. Some people chill the stamp on an ice pack between seals.
• The seal is thin, cracked or uneven at the edges. Use more wax, so the pool is clearly wider than the stamp head.
• Only part of the design shows. Press straight down with even pressure, and center the stamp on the pool.
• Dark streaks in the wax. That is usually soot from the flame. Hold the spoon a little higher above the flame.
• Bubbles on the surface. Pour slowly and close to the paper.

Wax sticks or wax beads?

Both work the same way once melted. Sticks are easy to break into even pieces. Beads let you measure a small amount and mix colors. Our Wax Seal Stamp Set with Gold Wax Beads and our Wax Seal Kit with 3 Stamp Heads use beads in corked glass bottles; the Rose Wax Seal Kit uses sticks.

How to mail a wax-sealed letter in the US

The USPS treats some letters as nonmachinable: they can't go through its letter-sorting machines, and they pay a surcharge. On its stamp store, the USPS gives envelopes with wax seals as an example of mail that needs a nonmachinable stamp.

Prices below are from USPS Notice 123, effective July 12, 2026, for single-piece First-Class Mail letters with stamps:

A few practical points:

• The easy option is a nonmachinable stamp. The USPS sells stamps marked for the nonmachinable rate. They cost $1.31 each and stay valid for 1 ounce of nonmachinable mail even if prices go up later.
• Keep the letter under 1/4 inch (about 6 mm) thick, seal included. Anything thicker is no longer a letter under USPS rules. It becomes a large envelope, and a large envelope that isn't uniformly thick pays parcel prices.
• A square envelope pays the surcharge even without a seal. Under the USPS mailing standards, a letter is nonmachinable if its length divided by its height is under 1.3, which covers square envelopes.
• Putting the sealed letter inside a second envelope usually doesn't avoid the surcharge. The same standards also cover contents that make a letter unevenly thick.
• The surcharge doesn't guarantee the seal survives. A wax seal can still crack in transit. For a keepsake, consider delivering it by hand or tucking the sealed note into a gift box.

Prices change, usually in January and July, so check the current USPS price list before a large mailing such as wedding invitations.

Gift ideas for letter writers

• Letter Writing Gift Set: the Rose Wax Seal Kit plus kraft-colored writing paper (10 large sheets and 2 small note sheets) and 20 kraft envelopes, so everything for a first sealed letter is in one box.
• Rose Wax Seal Kit: one rose-design stamp, three wax sticks, a spoon and tea lights in a book-style gift box.
• Wax Seal Kit with 3 Stamp Heads: three interchangeable stamp heads on one handle, two bottles of wax beads, a spoon, a tea light and a metallic pen.

Every order ships free within the US. See all letter writing gifts.

FAQ

Can you mail a letter with a wax seal? Yes. Within the US, pay the nonmachinable surcharge, either with a nonmachinable stamp or by adding $0.49 to the regular First-Class postage.

How much does it cost to mail a wax-sealed envelope? $1.31 for a letter up to 1 ounce, using USPS prices effective July 12, 2026. See the table above for heavier letters.

How long should I wait before pressing the stamp? A few seconds, until the edges of the wax pool start to set. Practice on scrap paper to find the timing for your wax.

Do I need a lighter? Yes, to light the tea light or candle. Many kits, including ours, don't include one.

The header image is an AI-generated illustration of our Rose Wax Seal Kit.