Vigourous stirring of paste will cause its viscosity to fall. (Sheer thinning) If your paste works after treatment like this, but not before, it suggests that the start/supplied viscosity is too high. I assume you are not trying to use paste taken straight from the refrigerator (cold paste is thicker than warm paste) so Maybe you are using a formulation which was correct when frst determined a while ago but has not followed changes in your work . Alternatively some paste suppliers do supply pastes with high initial viscosities which are intended to be sheer thinned on/by the printer into a usable viscosity range in continuing production. If this is so try using a more appropriate product. As a start suggest you check your supplier data sheet recomendations and compare to what you are actually doing and using, then speak to your supplier . Caution: This would be a break from standard industry practise: most people don't read anything before beating up on their supplier. Mike Fenner BSP ----------------------------------------------------------- Paul Stolar wrote Does anyone else have the problem with their no-clean solder paste needing about 20 kneeds to get the proper volume? If so, are there other ways to get there quicker? *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************