If you are standing in the hardware aisle deciding whether to grab a small butane torch or a propane burner for popping bubbles out of your resin, here is the short answer before the detail: for the overwhelming majority of resin work, butane is the right tool. A handheld butane torch gets hot enough, behaves predictably, and forgives the small mistakes every resin artist makes. Propane is a specialist tool you reach for only when the surface is genuinely large. The most common buying mistake is assuming the hotter flame is the better flame — it is not. The numbers in the comparison table below tell the story, but the logic behind them matters more than the raw temperatures.
Why fuel temperature is the wrong thing to compare for resin
Almost every “butane vs propane” debate online fixates on flame temperature, and that framing leads people to the wrong torch. Here is the reality: a handheld butane torch used for resin runs roughly 2,372-2,500 F (1,300-1,371 C), and a propane torch like the Bernzomatic TS8000 runs about 3,400 F (1,871 C), or near 3,650 F (2,010 C) on MAP-Pro. Both are dramatically hotter than anything the resin surface needs. You are not trying to melt or cook the resin — you are trying to warm the very top skin just enough to lower its surface tension so trapped micro-bubbles rise and burst. That happens in a fraction of a second of indirect heat. A flame at 2,400 F does it. A flame at 3,400 F does it. The extra thousand degrees on propane buys you nothing on a small pour except a wider margin for scorching.
What actually determines whether torching goes well is two things the temperature spec never tells you: flame size relative to the piece, and your dwell time. A torch that matches the surface lets you sweep evenly. A flame held too close, or paused for even a second too long, overheats one spot — and the higher the fuel temperature, the faster that mistake turns into a dimple, a ripple, a yellow patch, or an outright burn. So the honest comparison is not “which is hotter,” it is “which flame size and which control profile fits the piece in front of me.” For more on choosing between a torch and a heat gun in the first place, see our full buyer’s guide hub.
Butane torches: temperatures, flame size, refill, and cold-weather behavior
A butane torch is the default resin bubble tool because everything about it is scaled to small-and-medium work. The two butane units in the comparison above bracket the range most artists need. At the budget end, the Sondiko S907 reaches roughly 2,372-2,500 F (1,300-1,371 C) on a single pointed jet, carries about 10 g of fuel, and adds a transparent fuel gauge with a MAX fill line so you are never guessing how much butane is left. It is the cheapest reliable entry point for jewelry, coasters, bezels, and small molds — and for many makers it is the only torch they will ever need.
Step up to the Blazer GT8000 and you gain real flexibility. Its flame adjusts from a roughly 1.25-inch pinpoint up to about 5 inches, so the same torch handles delicate jewelry detail and a medium serving tray. It tops out near 2,500 F (1,371 C), holds about 35 g of butane for roughly 35 minutes of full-flame burn, fires instantly from its piezo igniter at any tilt over a mold, and its detachable base lets it stand upright as a hands-free bench torch. The anti-flare brass nozzle is the kind of build quality that separates it from a $15 culinary unit.
Butane does have two honest weaknesses, both visible in the specs. The reservoirs are small, so long sessions mean refills — though refilling from any butane can takes seconds. And butane’s vapor pressure drops in the cold, so a chilly garage in winter will leave you with a weaker flame than the same can produces at room temperature. Neither is a dealbreaker for indoor, room-temperature work, which is where most resin happens.
Propane torches: temperatures, BTU, and the scorch trade-off
Propane is the high-output option, and the spec sheet shows exactly what you are buying. The Bernzomatic TS8000 burns about 3,400 F (1,871 C) on propane and near 3,650 F (2,010 C) on MAP-Pro, with a heat output around 12,936 BTU/hr. That is roughly 900-1,000 F hotter than a butane resin torch, with far more total heat energy per second. On a small pour, all of that is liability, not benefit: hover for a beat too long and you will see ripples, yellowing, and burn marks appear faster than butane would ever produce them. The cylinder-mounted body is also bulky and awkward for the close, tilted detail work that jewelry and coasters demand.
So why does propane earn a place at all? Coverage. A torch that clears bubbles across a 6-foot river table in a handful of sweeps saves real time and gives a more even result than dabbing at it for ten minutes with a pinpoint butane jet. The catch is that a bare propane jet is a narrow, scorch-prone point — using it raw on a flat surface is asking for trouble. The fix is the flame-spreader clip, covered next.
The deciding factor: match flame size to piece size, not max heat
This is the rule that should drive your purchase. Picture the surface you torch most often. If it is coasters, jewelry, bezels, small-to-medium trays — anything you can comfortably cover by hand — a butane torch is correct, and the GT8000 or S907 will serve you for years. If your routine is river tables, large serving trays, or tabletops 24 inches and wider, a single butane jet becomes a chore, and a propane torch with a spreader earns its place. The raw-fuel theoretical-max column in the comparison table is there to make the same point a third way: those numbers depend entirely on tip and spreader, and matching flame size to piece size beats chasing the highest temperature every time. Our companion piece, the best torch for resin guide, walks through specific picks if you want a shortlist rather than a head-to-head.
When propane wins: river tables and the flame-spreader clip
The single reason professionals reach for propane on big work is the flame-spreader attachment. A spreader clip — such as the Bernzomatic stainless spreader — slips over the torch tip and converts the concentrated swirl jet into a flat, wide fan. That fan distributes the heat across a broad band instead of a single point, which does two things at once: it clears bubbles across a wide area in far fewer passes, and it dramatically lowers the single-point scorch risk that makes a bare propane jet dangerous on flat resin. The Bernzomatic Artist head plus spreader in the lineup above is the budget route to that capability; the TS8000 plus the same clip is the more rugged route. Either way, the spreader is the whole point. Without it, propane on a flat pour is a scorching risk; with it, propane becomes the fastest way to finish a large surface cleanly. For small work, a spreader is unnecessary and clumsy — which loops right back to butane.
Recommended torches by project
Working from smallest piece to largest: for jewelry, bezels, coasters, and small molds, the Sondiko S907 is the value pick — enough heat, a fuel gauge, one-handed control. For a maker who does a mix of small detail and medium trays and wants one torch to cover it, the Blazer GT8000 is the buy-once choice thanks to its 1.25-to-5-inch adjustable flame and bench-stand base. For anyone whose work is genuinely large — river tables, 24-inch-plus surfaces, tabletops — the answer is a propane torch with a spreader: the Bernzomatic Artist head plus spreader as the affordable option, or the TS8000 plus spreader for heavier, more frequent use. Full specs and price bands for each are in the product cards and the comparison table on this page. You can browse every torch, pressure pot, and resin we have tested from the comparisons index.
Correct torching technique: distance, pass duration, keep moving
The torch you buy matters less than how you use it, and the technique is identical for both fuels. Hold the flame 6-8 inches above the resin — never closer, and never letting the flame tip touch the surface. Move it constantly, in a slow, steady back-and-forth, exactly like ironing a shirt; the goal is to graze the surface with heat, not to aim at one spot. Each pass should last only 1-3 seconds over any given area, then move on. After a pass or two, stop and wait several minutes to let the resin cool before going again. Never park the flame. With propane this discipline is non-negotiable because its higher heat punishes mistakes faster, but the same rule keeps butane work clean too.
Troubleshooting: dimples, ripples, yellowing, micro-bubbles, and outgassing
If you see dimples or shallow craters appear, you held the torch too close or paused — back off to the full 6-8 inches and keep the flame moving. Ripples or a washboard texture mean too much heat over too large an area in one pass; use shorter, lighter sweeps. Yellowing or amber discoloration is over-torching, and it is permanent — the only fix is prevention, so cut your dwell time and your number of passes. If micro-bubbles keep rising minutes after you torch, that is often outgassing from a porous substrate like wood or a deep pour curing exothermically; a light seal coat on porous wood before the flood coat, and torching in stages as bubbles surface rather than all at once, both help. And if the flame seems weak and bubbles are not bursting, check your fuel — a near-empty butane reservoir or a cold room will sap the flame long before the torch is truly out. For a deeper dive into when a heat gun is the safer tool for outgassing-heavy work, the troubleshooting and heat-gun comparisons in our hub cover it in detail.
Safety note
Both fuels burn an open flame hot enough to ignite uncured resin vapors, solvents, paper towels, and isopropyl alcohol, so keep your workspace clear of anything flammable and work with ventilation. Resin manufacturers and torch makers consistently advise keeping the flame moving and at a distance; treat the 6-8 inch rule and the 1-3 second pass as safety guidance, not just finish guidance. Store cylinders and butane cans away from heat, let any propane spreader tip cool fully before storage, and never leave a lit torch unattended on the bench, even one with a stand. When in doubt about a specific resin’s flash behavior, follow the safety data sheet for the product you are pouring.
Bottom line: buy the butane torch unless your work is genuinely large, in which case buy a propane torch and the spreader clip — and either way, technique decides the result more than fuel does. The verdict and full specs are summarized on this page; for the broader equipment picture, start at the buyer’s guide hub.