MG Chemicals 421A Liquid Tin, Tin Plating Solution, 125mL Bottle

Pricey but works well.

I use a CNC router to make PCB's using a very small end mill. The resulting boards are cleaned with Tarn-X cleaner and then placed in this solution. The result is a uniform coating of tin that both protects the copper from tarnish and wets well with solder. This makes attaching surface mount parts much easier than on bare copper. So far I have made about 100 sq inches of PCB without any sign of exhausting the solution.

We like this liquid tin - it tins nicely, and quickly. We were looking for a replacement for the old TINNIT kit, and found this. It works WAY better than anything we've used.Just a word of caution - wear gloves when using the stuff - it has thiourea - nasty stuff, so use all the precautions as directed.Great stuff indeed.

This stuff loves to stick to copper!Wipe the part clean with a solvent, buff oxide off with 3M cloth and wipe solution on and rinse off with warm water. Use gloves!

Good stuff. I used it for a long time. The only thing is I can not figure it out yet is in term of area-minutes so that I can gauge how much tin is left. I know it says 21.5g/L so it has about 2.7g in that bottle. I also know 7 minutes get you 1 micron thickness. But I would like to know the area it can cover with 1 micron. Help MG Chemical?? Or Chemist??

Great stuff. works perfectly. Makes soldering easy and fast. Just be careful to wear mask and eye wear and gloves.

I used a Q-Tip and rubbed it over the copper.

Muy bueno. Rinde bastante