Hi IPA, Isopropyl alcohol, is a wetting agent. Regards Nigel In a message dated 08/12/2006 22:20:46 GMT Standard Time, andrew@xxxxxxxxxxxxxxxxx writes: Nigel You put a drop of IPA it ? Doesn't the gas in the beer ruin the joint ? Andy -----Original Message----- From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of NIGELBALL@xxxxxxx Sent: 08 December 2006 18:22 To: modeleng@xxxxxxxxxxxxx Subject: [modeleng] Re: Boiler descaling Hi All Phosphoric Acid is also used in the flux used for etch brass soldering construction kits, I used to make my own, 10% solution in water with a drop of IPA, (This fluxes the flux) and allows it to follow. I also believe it is used in rust inhibitors?. Regards Nigel Leicester MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.