Hi, You need to apply a zincate pretreatment to the alumimun proir to plating a layer of electrolus nickel. Then you can deposit the gold. Check out http://www.shipley.com EIF chemicals. Any problems email me. Regards, Russell A Davies Technical Sales Manager Chestech Ltd 79 Somers Road, Rugby. Warwickshire. CV22 7DG tel: 0044(0)1788 537535 fax: 0044(0)1788 535835 Mobile: 0044 (0)7966 253338 http://www.chestech.co.uk Any pricing and delivery details or offers transmitted via email are subject to confirmation at the time an order is placed. The information in this e-mail and any other files transmitted with it are intended for the named recipient(s) only. It may contain privileged and/or confidential information and if you are not the intended recipient you must not make any use of this information, or copy, distribute, show it to any person or take any action on it. If you have received this e-mail in error we would appreciate if you would notify Chestech Ltd immediately. Thankyou --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.512 / Virus Database: 309 - Release Date: 19/08/2003