

⚡ Seal Smart, Stay Connected — The Silicone That Works as Hard as You Do!
ASI 388 Clear Electronic Grade Silicone is a premium, one-part RTV silicone sealant designed specifically for electronic and electrical applications. It offers exceptional dielectric properties, waterproof protection, and resistance to extreme temperatures (-57°C to +204°C). Its neutral-cure, non-corrosive formula ensures safe use on sensitive metals like copper and silver, making it the go-to choice for professionals seeking reliable, long-lasting insulation and sealing in confined or large-scale production environments.
| ASIN | B0063U2RT8 |
| Best Sellers Rank | #11,173 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Silicone Adhesives |
| Brand | ASI |
| Color | Clear,Silver |
| Date First Available | November 5, 2011 |
| Full Cure Time | 7 Days |
| Is Discontinued By Manufacturer | No |
| Item Form | Paste |
| Item Weight | 3.52 ounces |
| Liquid Volume | 2.8 Fluid Ounces |
| Manufacturer | GordonGlass |
| Material | Silicone |
| Number of Items | 1 |
| Package Dimensions | 7.52 x 2.05 x 1.3 inches |
| Surface Recommendation | Pipe, Counter Top, Window, Door, Sink, Tub, Walls |
| Unit Count | 2.8 Fluid Ounces |
| Water Resistance Level | Waterproof |
P**Y
Keep it in a zip lock bag after opening.
It works well as a silicone but does take quite longer to cure than say GE Supreme. I ended up putting the project in the garage where it was more humid to help curing time. When I first put the tube away after use, I placed a piece of Saran Wrap (Stretch-Tight actually) between the nozzle and the cap to create an air-tight seal. It started to cure in the nozzle after just a week. The second tine I used it I did the same but also put the entire tube in a ziplock sandwich bag and squeezed out the air. That seems to have done the trick. Next time I opened it two weeks later it was flowing out as if I had a new tube. I'll take everyone's word for the safety around electronics (used in an outdoor LED project).
A**D
Great for electronics
I used this primarily to vibration-proof a somewhat-risky component substitution for an obsolete part. I would have liked something that cured a bit stiffer, but it's probably perfectly fine. And making it stiffer would probably make it less general-purpose than it is. Seems like a quality product. Noobs beware - if it smells like vinegar, IT'S NOT FOR ELECTRONICS! Do it right or don't do it. This is the right stuff.
G**E
Keeps the connections dry and working well for me.
Used this on my out door lighting wiring on my lightly covered porch. I have the wiring in electrical boxes but this is just a precaution that seems to have done the job. No moisture has gotten into the wiring as far as I can tell.
B**B
High-Quality Silicone That Does the Job Well
The ASI 388 clear electronic-grade silicone works exactly as advertised. It applies smoothly, cures evenly, and stays flexible once set. I used it for electronic sealing and insulation, and it adheres well without causing any issues to sensitive components. The clear finish looks clean and professional, and it provides good moisture protection. Cure time is reasonable, though it does take a bit longer to fully set compared to some quick-cure options. Overall, this is a reliable, high-quality silicone for electronics and precision work. Great performance with just minor room for improvement on cure time. Would definitely use it again.
R**.
Seals
Works good and doesn't stink.
C**W
Nice quality and spreads very well
Spreads nicely and the tube has a very nice screw on lid to keep from prematurely hardening. Time will tell how it hold up to weather.
V**B
Great stuff
This is great stuff. Used inside of wire nuts under my travel trailer. Keeps out water and will not corrode wiring like regular silicone.
K**O
Reliable Adhesive for Commercial Use
This Clear Electronic Grade Silicone is a trusted brand and adhesive that I regularly use for commercial purposes on our products. I have never had an issue with it. The instructions are straightforward, but even without reading them, it's pretty intuitive to use and let cure. It provides a reliable seal and adheres well to various surfaces. Highly recommended for anyone needing a dependable silicone adhesive.
Trustpilot
3 days ago
3 weeks ago