The Sunshine G-21 is a pro-grade black glue for phone repairs and crafts. It bonds electronics, leather, jewelry, and more. The needle-tip lets you apply small amounts with total control. Non-toxic and low odor. Ships fast from Brisbane.
Frequently Asked Questions
How do I apply G-21 for the best results?+
Start by cleaning both surfaces well. Use rubbing alcohol to remove oil and dust. Let everything dry fully. Then squeeze out a tiny bit of glue using the needle tip. Less glue is better than more. Press the parts together and hold for about 30 seconds. The glue will set in a few minutes but gets strongest after 24 hours. Store the bottle with the cap sealed tight so air does not dry it out.
What materials can G-21 glue bond?+
G-21 works on many materials. It bonds plastic, metal, glass, leather, rubber, and fabric. It is great for phone screens, back covers, and frames. Jewelers use it for stones and crystals. It works well on watch parts and leather goods too. Some very smooth plastics like PE or PP may need a light sand first. Always test on a small hidden spot if you are unsure. The black color shows on clear materials so plan ahead.
How long does G-21 take to dry?+
G-21 starts to set in 3 to 5 minutes at room temperature. After 30 to 60 minutes it is strong enough for light handling. Full cure takes about 24 hours. Wait the full day before putting stress on the bond. Warm rooms help it cure faster. Cold slows things down. Thin layers dry quicker than thick ones. Use less glue for faster dry time and cleaner finish.
Is G-21 safe to use indoors?+
Yes, G-21 is safe for indoor use. It is non-toxic and has low odor. You can use it all day in your workshop. Some fresh air is still a good idea. Open a window when you can. Do not eat or drink while using any glue. Keep it away from kids and pets. Wash your hands after use. If glue gets on skin it will peel off once dry. Overall it is much safer than many other workshop adhesives.
Can I use G-21 for phone screen repairs?+
Yes, G-21 is perfect for phone screen repairs. Technicians use it to bond screens, frames, and back covers. The needle tip lets you apply a thin line right where you need it. The black color hides nicely in phone frames. It stays flexible so screens do not pop off. Clean the old glue off first and wipe with alcohol. Apply a thin line around the frame. Press the screen in and hold. Wait 24 hours before giving it back to the customer.
How does G-21 compare to B7000 or T7000 glue?+
G-21 is in the same family as B7000 and T7000 adhesives. All three work for phone repairs and crafts. G-21 is made by Sunshine, a trusted repair tools brand. It has the same needle tip design for precise work. The black color is similar to T7000. Some techs prefer G-21 for its consistency and the Sunshine quality name. Try it yourself to see which you like best for your workflow.
Will the bond stay flexible after it dries?+
Yes, G-21 stays flexible when dry. It does not become hard and brittle like super glue. This is why it works so well on leather and phone frames. The items can flex and move without the bond cracking. Temperature changes do not hurt it either. From hot cars to cold winters, the glue holds up. This flexibility makes it ideal for things people use every day.
How do I stop the nozzle from clogging?+
Clean the needle tip after each use. Just wipe it with a soft cloth or tissue. Push the cap on firmly to seal out air. Store the bottle standing up in a cool dry spot. Keep it away from direct sun and heat. If the tip does clog, push a thin wire or needle through to clear it. Some techs keep a pin nearby just for this. Proper storage keeps the glue flowing smooth every time.
Can I use G-21 for jewelry making?+
Yes, G-21 works great for jewelry. The needle tip is perfect for tiny stones and crystals. Set gems, fix clasps, and bond metal parts with ease. The glue dries flexible so jewelry can move naturally. It bonds well to metals like silver and steel. Gemstones and glass crystals stick firmly too. Let pieces cure fully before wearing. The black color is hidden behind settings but plan ahead on clear parts.
How long does a 50ml bottle last?+
A 50ml bottle lasts a long time because you use so little each time. For phone repairs, one phone might use less than half a milliliter. So you could do over 100 phone repairs from one bottle. For hobby crafts you may use more per project. Either way, 50ml gives you plenty to work with. Store it properly and it stays good for months. The needle tip helps you control how much comes out so there is less waste.
Questions About This Glue?
Our Brisbane team helps technicians and hobbyists every day.
📍 Forest Lake, QLD 📞 0480 039 913
