In Hawaii corrosion, especially on aluminum, is a constant war. The air is full of salt and the humidity is high. Corrosion is terrible. Various solutions have been tried such as hosing down a new beam with WD40 before putting it up. Particularly troublesome are sliding, nesting aluminum tubes on beams and verticals.
In my experience, the more noxious and offensive a substance is to work with, the better it protects. An example is Aqua Lube, a substance that comes in a can like a paint can, has a consistency of melted green chewing gum, and seems to crawl up your arms like some living goop out of a Science Fiction movie. It is extremely effective even in areas where it is subjected to salt spray.
Here is a document from the ARRL on various so called "conductive greases." Actually they do not conduct at all. They are corrosion fighters designed to keep a decent aluminum connection protected from corrosion and degradation. Many contain "sacrificial metals" in addition to grease. But sticking an ohmmeter in these things generally will not produce a reading, other than open circuit. Their value is in keeping what started out as a good connection, alive and well as it is exposed to the harsh Hawaiian elements.
Here is a list of products and suppliers we keep on hand at ARRL HQ. These are all for protecting connections, but a good mechanical contact is still necessary. There is a grease available (I think it's called Conducto-Lube) that you can stick an ohmmeter in and get a low reading, but it is quite expensive (it contains silver).
The following is a list of paste and grease-like products for the prevention of oxidation of aluminum in electrical connections and antenna installations: (Prices could be out of date)
Manufacturer: Butternut Electronics Company 831 North Central Avenue Wood Dale, IL 60191 Tel: (708) 238-1854 Fax: (708) 238-1186 Product Name: Butter-It's-Not Source: Direct if not stocked by local authorized dealer. Price: $3.50/ Envelope NOTES: Contains copper dust in a molybdemum suspension. LOCAL NOTE: This one gets really good press from those who have used it.
Manufacturer: GB Electrical 6101 N. Baker Road Milwaukee, WI 53209 Tel: 1-800-558-4311 Product Name: OX-GARD Source: Available from many electrical supply houses and retail outlets such as Sears, Home Depot, Ace and True Value Hardware stores. No Factory direct sales. GB catalog number OX-100B. Price: Approximately 3.00/ 1-oz tube
Manufacturer: Ideal Industries, Inc. Becker Place Sycamore, IL 60178 Tel: 1-800-435-0705 and: 1-815-895-5181 Fax: 1-800-533-4483 Product Name: NOALOX Source: Distributors (Call 800 number for nearest one) Price: Ideal list price $2.58/ half oz tube (#30-024) and $8.64/8oz bottle (#30-030). NOTES: Also available from many electrical wholesale supply houses. No factory direct sales. Contains zinc particles suspended in a carrier.
Manufacturer: KLM Antennas Inc. PO Box 694 Monroe, WA 98272 Tel: 1-360-794-2923 Fax: 1-360-794-0294 Product Name: Conductive Paste Source: Factory direct and larger dealers. Price: $3.50 plus shipping & handling/ 1 ounce containers NOTES: Anti-seize thread compound Hi-Temperature MIL-A-907E. Contains copper and graphite flakes suspended in a petroleum base. Manufactured for Mirage/KLM by Chemical Commodities Agency, Inc. of Highland, CA per MIL-A-907E.
Manufacturer: Sanchem, Inc. 1600 S. Canal Street Chicago, IL 60616 Tel: 1-800-621-1603 Out of State: 1-312-733-6111 Fax: 1-312-733-7432 Product Name: NO-OX-ID Source: Direct from Manufacturer Price: $11/16oz can or $8.80/8oz tube (plus shipping) Minimum order - $35 NOTES: NO-OX-ID comes in several consistencies. NO-OX-ID "A" and NO-OX-ID "A-Special" are suitable for most antenna installations. NO-OX-ID "A-Special" is similar to NO-OX-ID "A" but has a small amount of solvent added for ease of application.
Manufacturer: Thomas & Betts Company 1555 Lynnfield Road Memphis, TN 38119 Tel: 1-800-888-0211 Fax: 1-800-888-0790 Product Name: Aluma-Shield Source: No direct factory sales. Available from many electrical supply distributors. Price: Approximately $11.44/ 8oz can. NOTES: Customer may call 800 number for location of nearest distributor. Contains zinc particles suspended in a petroleum base.
Manufacturer: Burndy Electrical 101 E. Industrial Park Dr. Manchester, NH, 03108 Tel: 1-800-346-4175 Fax: 1-800-346-9826 Product Name: Penetrox (PEN-A) Source: Electrical wholesalers Price: Approx. $6/ 3oz tube NOTES: Zinc particles suspended in a natural based compound. LOCAL NOTE: Loaded with metal, needs a lot of stirring before use with a stick etc., seems to work well on sliding, telescoping aluminum elements.
Manufacturer: Ilsco Corporation 4730 Madison Road Cincinnati, Ohio 45227 Tel: 1-513-533-6200 Fax: 1-513-533-6274 Product Name: DE-OX Source: No factory direct sales. Available from electrical supply wholesalers and distributors. Customer may call for nearest distributor. Price: Approximately $2.90/ 1oz, $4.90/ 4oz and $7.30/ 8oz squeeze bottle. NOTES: Used in the electrical trade for Al/Cu and Al/Al connections. Green colored grease with no noticeable particles in suspension.
Manufacturer: Antennas West PO Box 50062 Provo, Utah 84605 Tel: 1-801-373-8425 Fax: 1-801-373-8426 Product Name: Goose Grease Source: Factory direct sales only. Price: $1.00/ 1oz + and $1.00 p&h. NOTES: Transparent silicone grease. Antennas West also recommends this product for ground rod clamp connections.
Manufacturer: Mosley Electronics, Inc. 10812 Ambassador Blvd. St. Louis, MO 63132 Tel: 1-800-966-7539 and: 1-800-325-4016 and: 1-314-994-7872 Fax: 1-314-994-7873 Product Name: 1) Mosley Penatrox (Conductive Grease) 2) Weather Guard (Clear spray coating) Source: Factory direct sales only. Price: Mosley Penatrox- $4.45 / packet + postage. Weather Guard- $12.75/ 8oz spray can + shipping NOTES: Mosley Penatrox is a grease-like product. Weather Guard is a clear spray especially recommended for marine and coastal environments. Weather Guard cannot be shipped via the post office; UPS required.
Manufacturer: Loctite Corporation 1001 Troutbrook Crossing Rocky Hill, CT 06067-3910 Tele: 800-842-0041 Product Name: Permatex ANTI-SEIZE LUBRICANT Source: Many Automotive Supply Distributors Price: N/A NOTES: Comes in 1 oz squeeze tube, 8 fluid oz brush top container, and a 12 oz aerosol can. Can be used on the threads of U-bolts to prevent "seizing, galling, and corrosion." It aids in the disassembly of the the antenna's hardware. Not for use on electrical connections. The part no. on a 1 oz tube is 133A.