How to use UV resin
Updated: 23 October 2026
You have a bottle and a lamp, and the last piece is either tacky on top or soft in the middle. How to use UV resin comes down to a thin layer the light can reach, then a second look at anything the light missed. YIEHO says 1 minute, Let’s Resin says 15 minutes, and Bsrezn’s 400 g pack says 3E+1 minutes, which is not a timer. Work from the layer, not from the field. Product choice stays on the [UV resin comparison](/hub/fillers-adhesives-and-sprays/uv-resin). Listing fields and UK craft notes were used, not a lab. A qualifying purchase can earn us a commission at no extra cost to you.
You have a bottle and a lamp, and the last piece is either tacky on top or soft in the middle. How to use UV resin comes down to a thin layer the light can reach, then a second look at anything the light missed.
You have a bottle and a lamp, and the last piece is either tacky on top or soft in the middle. How to use UV resin comes down to a thin layer the light can reach, then a second look at anything the light missed. YIEHO says 1 minute, Let’s Resin says 15 minutes, and Bsrezn’s 400 g pack says 3E+1 minutes, which is not a timer. Work from the layer, not from the field. Product choice stays on the UV resin comparison. Listing fields and UK craft notes were used, not a lab. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Listed cure | Lamp | Pack | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  YIEHO YIEHO clear UV resin, 500 g | 1 minute | No | 500 g | 9.2 | about £16.99 | View offer |
 Let's Resin Let's Resin UV resin, 500 g | 15 minutes | No | 500 g | 8.2 | about £18.99 | View offer | |
| Best value |  Bsrezn Bsrezn UV resin, 400 g | Unreadable (3E+1) | No | 4 × 100 g | 8.8 | about £13.99 | View offer |
On this page
Set up before you open the bottle
Clear a table you can cover. Mouldd’s UK instructions start with a mat, gloves, and a dust-free mould. Nitrile gloves are the usual recommendation. UK guidance treats uncured resin as a skin and eye irritant and a sensitiser, and you still read the CLP label. Great Britain uses GB CLP. Northern Ireland uses EU CLP. A non-toxic line on the listing does not replace that label. Ventilate the room, do not look into the lamp, and do not pour leftover liquid down the sink. A mains lamp should be 230 V with a BS 1363 plug. None of these files states the plug. The Craft Resin kit is the 36 W box at £16.99, and the Bsrezn kit is the 6 W box at £11.99. If the plug is not a UK plug, or the lead is damaged, stop. Resin in an eye, or breathing difficulty, is NHS 111 or emergency care. Have isopropyl alcohol and a lint-free wipe ready for a tacky skin later, not as a thinner you stir into the bottle.
Thin layers and the lamp
Pour less than you think. Craft Resin’s UK collection describes layers of about 2–3 mm at 365–405 nm. Go Bespoke uses the same sort of depth. That is seller guidance, not a British Standard. A 2 mm coat in an open bezel can go hard. A 1 cm pour in one go often leaves a wet centre. A deep mould belongs with UV resin vs epoxy. Mouldd suggests 60–120 seconds, then a check, and a flip when you can reach the other face. Apex’s necklace tutorial uses at least a 36 W lamp and passes of about 120 seconds. A 6 W lamp is slower. Cure the back if light never saw it. YIEHO’s 1 minute field still assumes a thin clear layer. Let’s Resin’s 15 minute field shows that two bottles in this set do not share a clock. Bsrezn’s 3E+1 string is not “thirty minutes” printed as an instruction. A dense glitter load shades the liquid underneath. Use a sparse layer, cure it, then add a thin clear coat.
Sticky skin or a soft centre
A tacky surface on a piece that is hard underneath is a known UV effect. Oxygen can leave a thin inhibited film while the resin below has cured. Intertronics describes that for UV adhesives, and an isopropyl alcohol wipe. The bulletin is industrial, not a test of these twelve bottles. Wipe the film, do not drown the piece, and cure again. A soft or wet centre is a different fault: the light did not get there. Thickness, opaque pigment, a weak lamp, or a batch that stays wet even in a thin layer are the usual causes. More minutes under a 6 W lamp will not push light through a centimetre of mica. If a thin clear test on foil stays wet after several 120 second passes with a lamp you know works, stop. The Consumer Rights Act 2015 covers goods that are not as described. Do not sand a wet centre. Yellowing in a Bsrezn kit review, and in Craft Resin 500 g reviews, is a separate complaint from tack.
Sunlight and the closed bottle
Sunlight will cure a thin layer, and it is a poor plan for a British afternoon. Resin Pro’s UK FAQ gives about 15–60 minutes on a bright day for a thin layer, as that seller states. Cloud and a north-facing window stretch that or stop it. Go Bespoke treats sunlight as slower in the UK than a lamp. Use a windowsill only as a backup, and do not leave the open bottle beside the piece. The same light skins the resin in the neck. Store the bottle closed, upright, and in the dark. Do not freeze it and do not thin it with alcohol. Heat from a strong lamp on a tiny piece is a reason for short passes, not a ten-minute blast. If the mould is opaque, stop. The lamp will not finish the liquid from the outside.
Common questions
How thick should one layer be?
About 2–3 mm is the depth Craft Resin and Go Bespoke describe for UV craft resin. It is seller guidance, not a standard. Stay inside that for a clear layer, cure it, then add the next. A single pour that fills a deep pendant usually leaves a soft middle. If the job needs more depth than light can cure, use epoxy instead of a thicker UV pour. Glitter and mica count as thickness, because they block the light even when the liquid looks shallow.
How long should it stay under the lamp?
Check at 60–120 seconds, which is the range Mouldd and Apex use, then cure again if the layer is still soft. A 36 W lamp covers a small piece faster than a 6 W lamp. Listing fields in this set run from 1 minute to 15 minutes, and one field is unreadable, so they are not your clock. Flip the piece when the back has not seen the LEDs. Short passes also keep a small bezel from overheating under a close lamp.
Why is the surface sticky when the piece feels hard?
Oxygen can leave a thin tacky film on a cure that is solid underneath. Intertronics describes that inhibition and an isopropyl alcohol wipe for UV adhesives. Wipe lightly and cure again. If a toothpick still finds wet resin under the skin, you have an under-cured centre, not a surface film. Rebuild in thinner layers or abandon a batch that fails a clear test. Do not keep adding minutes to a centimetre of pigment.
Will sunlight in the UK replace a lamp?
On a bright day, Resin Pro’s FAQ allows about 15–60 minutes for a thin layer, and UK cloud often makes that optimistic. Sunlight is a backup, not a match for a 36 W lamp, and a 6 W lamp is already the slow end of this set. Keep the bottle out of the window while you wait. Dust on a long windowsill cure is a common way to spoil a dome that would have been fine under a lamp in two minutes.
Do I have to cure both sides?
Yes, when the back was in shadow. Tape on an open bezel, a setting lying flat, or a dome you only lit from above will leave the reverse soft. Flip it or light it from the back until that face is hard. A solid metal cup with no path for light is a bad UV job. You cannot cure through the metal, and a longer top-down blast does not reach the floor of the cup.
What if I add a lot of glitter?
A sparse mica load can cure. A dense load shades the resin under the flakes, and the centre stays wet while the top skins. Apex’s necklace tutorial keeps the mica light and finishes with a clear top coat. Pour a thin coloured layer, cure it for about two minutes, then dome with clear resin. If you have already poured a heavy mix in one go, do not expect another five minutes to finish it.
How do I store the bottle, and when should I stop?
Cap it and keep it in a dark cupboard, away from the lamp and the window. Stop if a thin clear test stays wet, if the lamp has no safe UK plug, or if the parcel is not the product the title described. Do not use the resin on food, on a toy, or on anything a child may mouth. Those uses are outside what these listings show. Eye contact or breathing difficulty needs NHS 111 or emergency care.
Related pages
Sources
Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 19 October 2026.
- HSE, The GB CLP Regulation (retrieved 19 October 2026)
- HSE, Consumers and workers (retrieved 19 October 2026)
- GOV.UK, General Product Safety Regulations 2005: Great Britain (retrieved 19 October 2026)
- GOV.UK, Product safety advice for businesses (retrieved 19 October 2026)
- Consumer Rights Act 2015 (retrieved 19 October 2026)
- Intertronics, UV curing and tack-free cures (retrieved 19 October 2026)
- Resin Studio, epoxy resin or UV resin (retrieved 19 October 2026)
- Craft Resin UK, UV resin (retrieved 19 October 2026)