Expired BIN primer

[Bob Timms]

I sprayed BIN primer on some raised MDF panels as a sealer prior to painting and its a little sticky after drying overnight. I discovered I was using a can of BIN well passed the 3 year expiration date. So my question is can I refinish with a new can of BIN or maybe some other finish before painting or should I just remake the panels?

[Mel Fulks]

I've got a can older than that and it's still good. Wondered before why it stayed good much longer than shellac I mix from
flakes. Sprayed on ,I guess you had to thin it , could the alcohol have water in it ?

[Bob Timms]

Its way past 3 yrs - I estimate at least 6 and possibly 7. I used it last year and it was fine so assumed it would be good this year.



I've got a can older than that and it's still good. Wondered before why it stayed good much longer than shellac I mix from
flakes. Sprayed on ,I guess you had to thin it , could the alcohol have water in it ?

[Al Launier]

I would try using Mineral Spirits to remove at least the sticky, perhaps even some of the primer. Let dry, then sand & apply "new" Bin.

[Prashun Patel]

BIN is a shellac-based primer. MS (I doubt) wouldn't work well on it. You might need to wipe it down with alcohol or (if you have safe access to it) acetone.

I wouldn't cover bad with good. A soft finish can prevent top coats from performing.

[Steve Schoene]

Alcohol will remove shellac. The other true solvent for shellac is ammonia--rather cheaper than denatured alcohol I suspect. But then be sure to rinse well.

[Bob Timms]

Thanks all. I may have dodged a bullet as they panels don't seem sticky now. Its been pretty humid here in GA and the BIN was also tinted both of which causes delayed dry time according to the MSDS. Will check them tomorrow and if they are the least bit tacky I'll remake the panels.

[Rich Engelhardt]

BIN is a shellac-based primer. MS (I doubt) wouldn't work well on it.
Correct - shellac is impervious to any petroleum based solvent.
That's one major reason why it's used as a gasket sealer. (see Indian Head)