How to Make Waterproof DIY Coasters

This How to Make DIY Coasters blog was written by a paid contributor. All photos were taken by Kate Hollingsworth

There’s nothing better than an icy cold drink on a hot summer's day. However, my joy is short-lived when condensation runs down the glass and leaves a watermark on the tabletop!

Having coasters readily available is an easy way to protect surfaces from water damage caused by beverages. I love a good craft project, so I thought, why not make DIY coasters?

After thinking over some DIY coaster ideas I decided to make three different types - wood, rope, and tile coasters. Flex Seal Mini and Flex Glue Mini were the perfect-sized products to help me assemble and waterproof my coasters. This craft was a lot of fun and I’m so happy with the results! Ready to learn how to make DIY coasters of your own? Let’s get started!

1. DIY Wood Pallet Coasters

Flex Seal Coaster made of wood

I had a feeling that mini pallet coasters would be irresistible to my kids, and I was right. They are the coasters they reach for first because they’re so cute. I was prepared for these particular coasters to be quite tricky to make, but they were actually easy to put together.

 

Flex Seal wood coaters materials

 

Materials

● 1 Flex Glue Mini, white

● 1 Flex Seal Mini, clear

● 52 popsicle sticks

● Scissors

● Wood stain (optional)

Steps

1. Cut Popsicle Sticks

Flex Seal wood coaters step one 

Start by using scissors to snip the rounded ends off the sticks.

2. Stain the Sticks (Optional)

Flex Seal wood coaster stain

 

Once my popsicle sticks were all trimmed, I used a tiny amount of wood stain on an old paintbrush to stain them. The sticks readily absorbed the stain, so by the time I finished with the first side, they were ready to be flipped over and stained on the other side.

Staining is optional. You can leave the sticks as-is for a lighter, beachier look or even spray them with Flex Seal – totally up to you!

Flexpert Tip: Use a drop sheet or newspaper to protect your work surface from the stain.

3. Connect Sticks With Flex Glue

Flex Seal coasters next step apply glue

These popsicle stick coasters are simple to assemble. First, lay out five sticks and put a dab of Flex Glue Mini at the end of each one.

Flexpert Tip: Come in a little from the very end of the sticks to create a more realistic-looking pallet.

Next, lay one popsicle stick on its side on the line of glue dots.

Flex Seal wood Coasters Step 5

Then, add a dab of Flex Glue to the middle of each stick.

Flex Seal Wooden coasters

Flexpert Tip: Hold the first cross-stick down firmly while adding the glue to keep the other sticks from shifting.

Lay the second cross-stick on its side along the line of glue dots.

Add a dab of Flex Glue to the ends of each stick.

Flexpert Tip: Hold the middle cross-stick down firmly while adding glue to stop the other sticks from shifting.

Flex Seal coaster step six

Lay the third cross-stick on its side along the line of glue dots.

Flex Glue wooden coasters

Flex Glue DIY coasters

Add dots of glue to the tops of each cross-stick in line with each of the bottom sticks.

Flex Seal master Step 5

Lay five top sticks in place atop the glue dots.

Flex Glue Coasters DIY

Allow 24 hours for the Flex Glue to dry. Once dry, dab a little stain over any visible glue areas to blend them in with the wood.

Flex Glue Coasters DIY finished

4. Waterproof Coasters With Flex Seal Clear

Spray coasters quirk Flex Seal Clear Mini

If you’ve ever wondered how to make waterproof coasters, Flex Seal is the answer. The Flex Seal Clear quickly and easily adds an invisible, waterproof layer to your DIY wood coasters.

Flexpert Tip: Make sure to use Flex Seal in a well-ventilated area. You may also want to put a drop sheet or newspapers down to protect your surface from overspray.

Flex Seal Spray protects the color of the coasters

I’m thrilled with how these mini pallet coasters turned out! They are my (and my kids’) favorite coaster of the bunch.

2. DIY Rope Coasters

DIY Rope Coasters with Flex Glue

These DIY rope coasters are perfect for that casual, beachy vibe. I thought these would be the easiest to make, but they were actually the most challenging. I chose to use sisal rope, which was quite difficult to coil. If I make another batch of these rope coasters, I’ll definitely go with a softer, more pliable rope. Trial and error are a big part of DIY-ing!

 

DIY Roap coasters materials

Materials

● 1 Flex Glue Mini, white

● 1 Flex Seal Mini, clear

● 10m rope

● 4 cork coasters

● Ribbon (optional)

Steps

1. Glue Rope onto Coaster

 DIY Coaster with Flex Glue Mini

Put a dot of Flex Glue Mini in the middle of your cork coaster and press the very end of the rope onto the glue.

Flexpert Tip: Try holding the end in place with a pin - I didn’t do this at the time, but I think it would have made the process easier!

 Glue the Rope with Flex Glue Mini

Add a circle of Flex Glue around the center and coil the rope on top of the glue. Continue to add circles of Flex Glue and coil the rope on top until you cover the entire coaster. 

DIY Rope coasters with Flex Glue Mini

When the rope lines up with the edge of the cork, cut the rope. You could simply glue the end of the rope down or try adding a piece of ribbon (leather would look great, too) to cover the end.

Add Flex Glue just past the length of the rope.

DIY Coasters with Flex Glue step 3

Stick a piece of ribbon down and add Flex Glue on top.

Add Flex Glue to the rope.

Stick the rope's end to the ribbon and add Flex Glue to the rope.

 Fold the ribbon over and glue with Flex Glue Mini

Fold the ribbon over and glue the end to the bottom of the cork round. Hold in place with an alligator clip until the glue dries (24-48 hours).

Clip until the Flex Glue is completely dry 

2. Waterproof Coasters With Flex Seal

Seal your DIY rope coasters with a couple of coats of Flex Seal spray in clear. This will add a waterproof layer to the coasters.

Waterproof coasters with Flex Seal Mini

 

These rope coasters certainly have the coastal look I was going for, and I like the finishing touch of the white ribbon.

DIY Coasters sealed with Flex Seal Mini

 

3. DIY Marble Tile Coasters

DIY Marble Coasters with Flex Seal

Materials

● 1 Flex Glue Mini, white

● 1 Flex Seal Mini, clear

● 1 sheet of mosaic tiles

● 4 cork coasters

Steps

1. Glue Tiles Together

Start by pulling the tiles off their mesh backing.

Pull the tiles off their mesh backing.

Next, add Flex Glue Mini to all six sides of one tile and place that tile face down on the table. 

Apply Flex Glue Mini to the sides of the marble pieces

Separate and glue the marble pieces from the mesh

Join a second tile by simply pressing the two tile edges together.

Join a second tile with Flex Glue Mini

Add a line of Flex Glue to one edge of the third tile and join to the first two tiles.

Flexpert Tip: Remember that the original tile already has glue on all edges.

Add a line of Flex Glue to one edge of the third tile

Keep attaching tiles around the center tile, and add Flex glue between any edges that you are joining.

Keep attaching tiles around the center tile, and add Flex glue between any edges

Continue adding tiles with Flex Glue Mini

Finish the base and make sure everything is firmly attached with Flex Glue

2. Attach Marble to Cork With Flex Glue

Cover a cork coaster with Flex Glue and press it down onto the tiles for about 15-30 seconds to activate Flex Glue’s instant grab.

Attach Marble to Cork With Flex Glue

Flexpert Tip: Remember, the tiles are face down, so you’re gluing the cork to their backs.

Glue the crock to the marble pieces with Flex Glue

3. Seal Coasters With Flex Seal Clear

Add a waterproof layer of protection to your DIY tile coasters with Flex Seal Clear.

Once the glue has dried, it’s time to add a waterproof layer of protection to your DIY tile coasters with Flex Seal Clear. Flip the marble coasters over and spray them with 1-2 coats.

Flexpert Tip: Remember to spray Flex Seal in a well-ventilated area. If you apply multiple coats of Flex Seal, allow the first coat to dry before adding additional coats.

These marble coasters are so beautiful, and I love their flower shape. Putting my icy cold glass down on one of these feels very luxurious. They’d make a great housewarming present or host gift too!

DIY Coasters with Flex Seal and Flex Glue Mini

All three of these DIY coasters were enjoyable and easy crafts to try. Hopefully, I’ve given you some inspiration and guidance on how to make coasters of your own!

By Kate Hollingsworth

Based in Perth, Australia, I am a self-taught interior specialist with over 20 years of DIY knowledge. I am a Content Creator on IG, where I share tutorials, before and afters, and easy-to-follow stories empowering women to attempt home DIYs.

 

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