Colourful Crocheted Coasters (with Waterproof Backing)

crocheted coaster with waterproof backing free pattern

Coasters are a common crocheting project and there are many nice looking patterns out there, however although I've been crocheting since first grade, I've never made any. As much as I've liked how they look, a coaster made of any kind of fabric that absorbs liquid just didn't really make sense to me. Certainly they would look cute sitting under a dry glass, but if that glass had cold liquid in it, it would inevitably be wet on the outside, and the coaster would let the moisture to go right through, ruining any wooden tabletop they were meant to protect.

So I set about figuring out a way to make some crocheted coasters that have a waterproof backing.

I found a free pattern online for these nice looking colourful ones, Simple Arts Planet Sunshine Coaster, but before beginning them I had a good think about how to make them waterproof. Plastic that was stiff enough to keep them flat, but thin enough to easily cut and stitch through was in order, and I found just the right material in the office supply section of the dollar store - an inexpensive plastic binder did the trick.

First I crocheted the coasters using some cotton yarn (left over from this project for a garland of flowers we currently have hanging in our kitchen). There are two sizes included in the pattern and I made the smaller one.

crocheting simpleartsplanet sunshine coaster free pattern

crocheted coaster simpleartsplanet sunshine coaster free pattern before adding waterproof backing

Then I measured to determine how large to make the plastic disks to stitch onto the backs. Note that the disks are smaller than the completed coasters, so the 'petals' hang over the edge and you can't see the plastic from the right side, except a bit through the holes between the stitches. I used a bowl that was about the right size to make a round paper template. I also marked the places through which I would pass the needle and thread to stitch the plastic to the coasters.

[Over-Complication Alert : The pattern I used has eleven points or petals, so figuring out exactly where to pre-punch the holes to stitch through was a bit more tricky that it would have been if there had been an even number of points, in which case I could just have folded the circle in half, and then again, until I had as many folds as there were points, and then used the folds as a guideline for the holes. Anyway, I found the right spots to make my holes by putting the template on one of the coasters and marking it by eye. Then I went back with a ruler and determined the accurate spacing. Of course you could just stitch anywhere through the plastic and not worry about the spacing between the stitches being equal all around, since that part is on the underside of the coaster and nobody would ever notice but you, but hey, sometimes I make things more difficult than they have to be!]

Then I traced the template onto the plastic of the binder using a pencil (which you can actually see on the black plastic), and cut them out with regular scissors. I pre-punched the stitching holes with an awl (although a tack would work fine for that too).

supplies to make waterproof backing for crocheted coasters

plastic waterproof backing to add to crocheted coasters

making crocheted coasters with waterproof backings

adding waterproof backing to crocheted coaster

crocheted coaster with waterproof backing cotton loulou downtown

Then I just hand-stitched the plastic disks onto the back of the coasters.

We've been using the finished coasters daily, and they really work well at keeping the tabletop dry, no matter how sweaty the glass gets. Plus, they make excellent Frisbees lol.

crocheted coaster simpleartsplanet free pattern with added waterproof backing

coaster with glass from above

crocheted coaster 01

crocheted coaster 02

crocheted coaster 03

This method of making a waterproof crocheted piece could be used on any shape of coaster. Since I only used one side of the binder to make all four of these, I'm planning to use the other half to back a larger crocheted table-mat, that I'll use under a plant.

Thanks for taking a look. I hope my friends who like to crochet will find this idea helpful.
xo loulou

[Follow up - Summer 2018 : Now on their 4th summer of use, these coasters still look really good! We've used them a lot, when our cold drinks have become quite wet with condensation and all wooden surfaces remain unmarked by moisture damage. In fact, they've turned out to be amoungst the most used things I've ever made!

I've hand washed them by wetting them and gently rubbing liquid detergent on with my fingers. Then I rinsed them well and layed them flat to dry.

They've done a really good job at doing what they're meant to do, all while looking cute and cheerful!]
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11 Responses to Colourful Crocheted Coasters (with Waterproof Backing)

  1. Gaia says:

    Lovely set of coasters, and thanks for tutorial to make them waterproof.

  2. Vix says:

    I can’t crochet but can appreciate how beautiful these are and clever, too. Show us them used as a frisbee, please!! xxx

  3. Hollie says:

    Those look great! You’re the crochet queen!

  4. Julie says:

    those are so awesome, and the plastic backing is a great idea!

  5. Kaisa says:

    Great tip with adding the plastic back! I will keep it in mind for the future.

  6. Pingback: 10 Free Crochet Coaster Patterns

  7. Patti Oonk says:

    Would it work to glue the plastic to the crocheted coaster?

  8. Beth says:

    What plastic did you use and where did you purchase it?

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