Sealbrite 230-10 was a marvellous solderable coating made by Lonco in 
Bensenville, IL, many years ago. This company was taken over by the 
Alpha/Cookson Group over 12 years ago and I don't know whether the 
product was discontinued.

I believe it was a simple lacquer with a mixture of pure WW rosin and a 
synthetic polymer (possibly acrylic) in a toluol or xylol solution 
(flammable and toxic). It left a quick-drying very thin film that would 
preserve the solderability of copper under good storage for 6-18 months.

I used tonnes of the great stuff when making guaranteed ultra-solderable 
bare copper boards in the late 1960s.

Brian

Charming Chan wrote:
> Hello All, 
> 
> Does anyone help input something about surface finish SEAL BRITE COATING?  I got a talk with pcb fab shop today and I was told that there was SEAL BRITE COATING available for pcb surface treatment. I know nothing about such surface finish and I'm quite curious. Thank you.
> 
> Best Regards
> Charming Chan
> 
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