Koolada is not mint, simply a cooling sensation. Try mixing Watermelon with Menthol.

Also, please reference:

https://www.reddit.com/r/DIY_eJuice/comments/3n3ktg/anyone_know_a_good_watermelon_menthol_recipe/?ref=search_posts

https://www.reddit.com/r/DIY_eJuice/comments/3j6s3r/recipe_a_softer_smoother_watermelon_menthol/?ref=search_posts

https://www.reddit.com/r/DIY_eJuice/comments/2uuot7/i_nailed_down_my_first_edv_recipe_i_call_it_minty/?ref=search_posts

https://www.reddit.com/r/DIY_eJuice/comments/2llf5j/wapplemelon_menthol_w_a_twist/?ref=search_posts

These were all found utilizing the Reddit search feature and searching for "Watermelon Menthol"

I'd recommend adding hint of strawberry. It compliments watermelon very well.

I've come up with a lovely cool melon recipe I enjoy from time to time. Although it's a bit odd tasting as it uses INW Melon instead of an actual watermelon flavor, but that's whats special to me about it.

INW Melon 4%

TFA Strawberry Ripe 5%

TFA Koolada 1%

My first juice ever was a watermelon menthol I had a local shop make me, and still today it's one of my favorite flavor profiles.

I've been working on this one for quite some time and am a 120ml from sharing on here with the flavor notes. This is a Cactus Melon Cooler. You could omit the Cactus to just have a Melon Cooler. I would just recommend bumping the flavor down a bit though as it adds a juicy feel to the whole thing. that being said, I should have a writeup soon with all the flavor notes since my 120ml is a little over half gone.

1% Cactus (INAWERA)
1% Cantaloupe (CAP)
0.5% Dragon fruit (INAWERA)
1.5% Honeydew Melon (CAP)
1% Jackfruit (TPA)
4% Jungle Juice (FW)
1.25% Koolada 10% (TPA)
2.5% LA Watermelon (colorless)
0.25% Lemon Sicily (FA)
0.5% Marshmallow (FA)
3% Watermelon (Flavorah)
1.5% Wild Melon (Flavorah)

If it actually tastes like mint and not menthol, try CAP Cool Mint or basically any spearmint (TFA/CAP)

I've worked on this recipe for a couple months now and it's my favorite adv, I've burned through a good 60ml this week of it and I'm going to mix another 240 of it tomorrow hopefully. Everybody who's tried it loves it (so far)

8% double watermelon (capellas)
4% unicorn vomit (flavor west)
2% strawberry (flavors apprentice)
1% koolada (flavors apprentice)

I've mixed it anywhere from 50-85% vg and that part really just depends on the throat hit you want, 70/30 seems to be the sweet spot. If you shake and vape it, drop in 1% sour, if you have time to let it steep forget the sour, it won't need it and it will mute the overall flavor.

Awesome, just what I was looking for!

I have never tried that flavor, but my "watermelon kiss" is

4% watermelon (cap) 4% watermelon candy(tfa) 2% honeydew (cap) 1.5% wintergreen (tfa) .5% mohito (tfa)

Sucralose

Menthol to taste

Maybe try another melon/honeydew in your recipe?

Kryptonite (Cosmic Fog) Clone by /u/RobocopSuperFan

15% FW Watermelon

1 drop per 15ml FW Menthol

You can try subbing menthol for Koolada, but my experience with TFA Watermelon has never been a good one. I just got FW Watermelon a couple weeks ago and it smells soo much better than TFA.

I make a juice for a friend that loves watermelon menthol,

18% TFA Watermelon 1.5% Koolada (or menthol)

He swears its the greatest thing he's ever tasted, I think it's pretty good too. I know the flavor percentage is really high but honestly it just seems to work.

I use 8% watermelon, 0.45% koolada & 0.5% menthol, all TFA.

you could try the watermelon chill by elements

Bombies seven seas clone is my adv right now