The first Surf Candy I ever finished with UV resin is still in a box somewhere. It is still slightly sticky.
I tie mostly saltwater flies, at a bench in Cape St Francis on South Africa's south coast, for fish that have very little respect for my thread work. My boxes are full of things with gaping mouths and enough UV resin to qualify as a small art installation. So when I first swapped the epoxy for UV resin, I thought the hard part was over. Squeeze, shape, click, glass. That was the promise.
What I got was a fly with a beautiful clear head that never quite stopped being tacky. Then another one. Then a whole evening's worth, lined up on the windowsill like a row of failed toffees. I did what every tyer does. I blamed the resin. I bought a different resin. Same toffees.
It took me longer than I'd like to admit to work out that the resin was never the problem. The light was. I'd been trying to cure big, thick saltwater heads with a little torch that simply didn't have the punch to get through all that resin. The day I finally used a proper curing light, the heads went hard right through, the layers bonded cleanly, and I stopped leaving flies out in the sun and hoping for the best.
Here's what I've learned since: this isn't just a saltwater problem. The trout tyer coating a Perdigon, the bass tyer building a popper face, the beginner sealing the head of a first Woolly Bugger, we're all relying on the same chemistry and the same little purple light. Get the match right and UV resin is the closest thing to a magic trick at the bench. Get it wrong and you get toffees.
So this is the guide I wish I'd had. Whether you've tied three flies or three thousand, pull up a chair.
The short answer: UV resin is a liquid coating that hardens in seconds under ultraviolet light. Most tyers only need a thin resin, a thick resin and a curing light that's strong enough and matched to the resin's wavelength. The light matters as much as the bottle.
What is UV resin, and why do fly tyers use it?
UV resin is a liquid coating that stays workable until you expose it to ultraviolet light, at which point it hardens in seconds. That single quality is why it has taken over so many benches. Traditional head cement dries in the air on its own schedule, and two-part epoxy starts the clock the moment you mix it. UV resin waits for you.
On a fly, that patience translates into three jobs:
- Protection. A coat over thread wraps and heads keeps teeth, rocks and casting from unraveling your work.
- Shape. Thicker resins build heads, bodies, shells and eyes, adding profile you couldn't get from thread alone.
- Fixing. A drop can lock materials in place mid-tie, secure a stick-on eye, or rescue a fly that's started to come apart.
If you tie for toothy fish, you already know why this matters. In my Ultimate Guide to Tying Bluefish Flies, resin is the difference between a fly that survives a bluefish and one that comes back as a bare hook.
Why the light matters as much as the resin
Here's what I wish someone had told me before my windowsill full of toffees. UV resin doesn't really dry. It cures. Most fly tying resins contain a photoinitiator, a compound that absorbs light at particular ultraviolet wavelengths and kicks off a reaction that links the liquid into a solid. No light at the right wavelength, no reaction. That's why the resin sits patiently in the bottle, and why your choice of torch matters as much as your choice of resin.
Wavelength is measured in nanometers (nm), and the lights tyers use typically sit in the upper end of the UV range. The J. Stockard UV Light emits at 385 to 400nm, Loon's UV Bench Light runs at 395nm, and Loon's UV Infiniti Light covers 395 to 405nm. The practical takeaway is simple: use a light the resin maker recommends, or one that matches their stated wavelength.
Power matters too. A weak or fading light, or one held too far from the fly, may leave the surface soft or sticky even when the resin underneath has set. Upavon says as much about its own Sure Set UV Torch, which is built to cure fully "without the tacky surface that underpowered torches leave behind." With some formulas, oxygen in the air can also slow the cure at the very surface. If you've ever finished a beautiful head that stayed faintly tacky, one of those is the likely culprit, not you.
Thin, thick, flex or tack-free: which UV resin should you buy?
Resins are sold mostly by viscosity, which is just a measure of how runny they are. Think of it as choosing between water, honey and toothpaste.
Thin resins flow into thread wraps and soak into materials, leaving a light, hard coat. They're the everyday choice for whip finishes, heads on trout flies and sealing thread bodies. Try Solarez Fly Tie Thin Hard Formula, or the thin or ultra-thin "flow" versions of Loon UV Clear Fly Finish. Semperfli No Tack UV Thin, described as having "the viscosity of light honey," is handy for locking down bucktail or hair as you tie, without building bulk.
Thick resins stay where you put them, which makes them the tool for building shape: baitfish heads, shellbacks, bodies and eyes. Solarez Fly Tie Thick Hard Formula is the bench standard here, and Loon's thick UV Clear Fly Finish does the same job.
Flexible resins cure with some give, so they suit soft bodies, swimming tails and anything that needs to bend without cracking. Look at Solarez Fly Tie Flex Formula.
Tack-free resins are formulated to cure to
to cure to a dry, glossy surface with no wiping. Solarez Fly Tie Bone Dry cures, in Solarez's words, "to a clear, hard, glossy finish in under 10 seconds," and Upavon Crystal Coat UV Resin is built for Perdigon bodies and slim nymph heads where a glassy finish is part of the design.
If you're not sure where you'll land, the Solarez Fly Tie 3 Pack is the friendliest place to start: Thin Hard, Thick Hard and Flex in 5 gram tubes, enough to find out what you actually reach for before you commit to bigger bottles.
Which UV curing light do you need?
You don't need the most powerful light on the market to tie good flies. You need one that's strong enough for the resin and the size of fly you tie most.
- Getting started: The J. Stockard UV Light is a simple LED flashlight made to cure all the UV coatings J. Stockard sells. The Loon UV Nano Light is pocket-sized, which Loon pitches as "an excellent option as an economical light for tyers just getting started."
- Everyday bench use: Loon's UV Bench Light is its best-selling "do-it-all" light, a 3-watt, 395nm torch with a high-intensity beam.
- Heavy use and big flies: The Loon UV Infiniti Light is a 10-watt, USB-rechargeable light Loon describes as its most powerful. The Upavon Sure Set UV Torch is a dedicated curing light paired with Crystal Coat.
- Travel: The Solarez PRO Roadie Kit bundles a half-ounce resin assortment with a UVA flashlight, a sensible box for the truck or the road.
How do you get a clean, clear cure?
A few habits will save you a lot of sticky, lumpy heads:
- Go thin and build in layers. Two or three thin coats, each cured, look cleaner and cure more reliably than one thick glob.
- Let the vise do the work. Rotating the fly as you apply resin keeps the coat even and stops it pooling on the underside. If you tie on a rotary, here's how to make the most of your rotary vise.
- Tack it, then finish it. Solarez suggests that with its Thick Hard Formula, a 30 second partial cure lets you keep working, while a full cure takes around three minutes with a flashlight or exposure to sunlight. Check each resin's own guidance.
- Get the light close. Hold the torch near the fly and move it around so every surface gets a direct hit.
- Keep the bottle in the shade. Sunlight cures UV resin too, so cap your bottles and keep them out of a sunny window.
- Look after yourself. Don't look directly into a UV light, keep resin off your skin, and tie somewhere with decent airflow. Follow the safety notes on each product.
The Surf Candy: where it all clicks
If you want one fly that shows off what resin can do, tie a Surf Candy. Bob Popovics' classic baitfish pattern is basically a slim wing of synthetic fiber encased in a clear, hard shell, with eyes set into the coating. It was originally built with epoxy, and UV resin has made it far more approachable: no mixing, no racing the clock, and no rotating drying wheel.
It's also a lovely lesson in viscosity. A thin resin locks the wing down, a thick resin builds that glassy, translucent body, and a final thin coat polishes it. As I put it in the bluefish guide, you coat the whole thing "until it feels like a saltwater lollipop."
Where should a beginner start?
Keep it simple. One Solarez Fly Tie 3 Pack, one J. Stockard UV Light or Loon UV Nano Light, and a dozen woolly buggers or simple nymphs to practice on. Coat a few heads with thin resin. Build one shellback with the thick. Ruin one fly on purpose to see what too much resin looks like. You'll learn more in that one evening than from any guide, this one included.
And if you've been tying for years and still reach for head cement out of habit, try a bottle of Bone Dry or Crystal Coat on your next batch of nymphs. You may not go back.
My windowsill is toffee-free these days. The Surf Candies come off the vise hard and glassy, the lights live within arm's reach, and I spend a lot less time blaming perfectly good resin. If there's one lesson from the whole journey, it's that fly tying is about light more than we give it credit for: the light you tie by, and the light you cure with.
Which is exactly why I want to see yours. Show Us Your Bench is J. Stockard's annual community showcase, and it isn't a competition. No judges, no prize for the tidiest desk. Just real benches, as they really are. Show us the window you tie by, the lamp you finally upgraded, the clip-on light on your vise stem and the curing torch that ended your own toffee era. If your bench could use a better light, the cordless Zephr Fly Tying LED Light clamps straight onto a 3/8 inch vise stem.
Here is how to get involved:
Take a photo of your bench as it really is. No need to clean up. The half-finished fly, the pile of hackle, and the coffee mug are all welcome.
Post it on Instagram or Facebook and tag us. Use the hashtag #ShowUsYourBench.
Tag two of your fly tying mates and challenge them to post there benches. (Purely optional but the idea here is classic - the more the merrier.)
Tell us a little about it. Where your bench lives, what you tie most, and the one tool you'd grab first if the house caught fire.
Email it to us for free shipping. Send the same photo to service@jsflyfishing.com and you'll receive free shipping on your next J. Stockard order. *Applies to orders within the USA only.
