 What to Spray on the Bottom of Relay Board, Cleaned and Tested Ready to coat |
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| 914Sixer |
 Jan 17 2009, 06:38 PM
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#1
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914 Guru  Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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What type of sealer should I use on the bottom of these?
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Replies(1 - 14)
| StratPlayer |
Jan 17 2009, 07:51 PM
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#2
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StratPlayer Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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Use liquid electrical tape... You can get it a home depot, stuff works great for that application. I've done 2 boards using liquid electrical tape.
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| McMark |
Jan 17 2009, 09:05 PM
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#3
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Good idea! (IMG:style_emoticons/default/thumb3d.gif)
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| 914Sixer |
Jan 18 2009, 09:00 AM
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#4
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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I tried that earlier and it just ran off the copper. I will try cleaning it with lacquer cleaner and see if it will stick.
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| KevinP |
Jan 18 2009, 09:08 AM
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#5
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Member Group: Members Posts: 205 Joined: 16-November 04 From: Orlando,FL Member No.: 3,127 |
I have been using an aircraft grade expoxie that has been on the relay board for about 14 years now. No problems yet.
KP |
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| rfuerst911sc |
Jan 18 2009, 09:14 AM
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#6
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Advanced Member Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States |
A good electrical parts store might sell you a small amount of conformal coat which is what is used today on almost all boards. This would be what I would use as the first step to seal the board traces from corrosion. I don't know if you need anything after the conformal coat to strengthen the board so it doesn't flex? I'm guessing maybe that's why Porsche used the goop they did. (IMG:style_emoticons/default/confused24.gif)
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| JFJ914 |
Jan 18 2009, 10:42 AM
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#7
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Senior Member Group: Benefactors Posts: 813 Joined: 13-June 03 From: Alpharetta, GA Member No.: 814 Region Association: South East States 
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What did you clean the traces with so the solder would flow?
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| Katmanken |
Jan 18 2009, 11:38 AM
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#8
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
What you want is what the electrical guys call "potting compound". Comes in silicone and epoxy and is used to "pot" or seal electrical components. Comes in conducting and nonconducting. We want nonconducting.
Some types have a self leveling feature (low viscoscity) so it will ooze across the board and create a level pool. This is what we want. Potting compounds used to be silicone, but epoxies are used a lot now. To my way of thinking, this is a 30 year old car and the potting compound may need to be removed later for another fix. Silicone is much easier to dig out than epoxy, so I would suggest silicone. Searching silicone potting compound prices turned up this linky for $18 a tube. Linky fixed Ken |
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| StratPlayer |
Jan 18 2009, 11:52 AM
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#9
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StratPlayer Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains
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Hmmmm it ran off the copper,,,, did you use a spray version of that. I used the liquid tape that had to be brushed on. Never had such a problem using it.
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| IronHillRestorations |
Jan 18 2009, 12:05 PM
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#10
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I. I. R. C. Group: Members Posts: 6,731 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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Dave Shepard and Glenn Stazak used to use a two part potting epoxy that worked good.
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| PeeGreen 914 |
Jan 18 2009, 12:17 PM
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#11
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Just when you think you're done...wait, there is more..lol Group: Members Posts: 10,219 Joined: 21-September 06 From: Seattle, WA... actually Everett Member No.: 6,884 Region Association: Pacific Northwest
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QUOTE(kwales @ Jan 18 2009, 09:38 AM)  What you want is what the electrical guys call "potting compound". Comes in silicone and epoxy and is used to "pot" or seal electrical components. Comes in conducting and nonconducting. We want nonconducting. Some types have a self leveling feature (low viscoscity) so it will ooze across the board and create a level pool. This is what we want. Potting compounds used to be silicone, but epoxies are used a lot now. To my way of thinking, this is a 30 year old car and the potting compound may need to be removed later for another fix. Silicone is much easier to dig out than epoxy, so I would suggest silicone. Searching silicone potting compound prices turned up this linky for $18 a tube. Silicone Potting Compound $18 a tube]Silicone Potting compound linky[/url] Ken Ken, the link says it is broken. Can you redo it please. I would love to see what this stuff is. (IMG:style_emoticons/default/beerchug.gif) |
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| restore2seater |
Jan 18 2009, 01:28 PM
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#12
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Future 914 copilot. Group: Members Posts: 311 Joined: 30-October 04 From: Dunlap,IL Member No.: 3,037 Region Association: None |
QUOTE(Phoenix 914-6GT @ Jan 18 2009, 12:17 PM) QUOTE(kwales @ Jan 18 2009, 09:38 AM) What you want is what the electrical guys call "potting compound". Comes in silicone and epoxy and is used to "pot" or seal electrical components. Comes in conducting and nonconducting. We want nonconducting. Some types have a self leveling feature (low viscoscity) so it will ooze across the board and create a level pool. This is what we want. Potting compounds used to be silicone, but epoxies are used a lot now. To my way of thinking, this is a 30 year old car and the potting compound may need to be removed later for another fix. Silicone is much easier to dig out than epoxy, so I would suggest silicone. Searching silicone potting compound prices turned up this linky for $18 a tube. Silicone Potting Compound $18 a tube]Silicone Potting compound linky[/url] Ken Ken, the link says it is broken. Can you redo it please. I would love to see what this stuff is. (IMG:style_emoticons/default/beerchug.gif) I think this is what he was trying for. Silicone Potting Compound. |
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| Aaron Cox |
Jan 18 2009, 07:36 PM
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#13
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
Potting compound works well.
I used Black RTV, and it is still good (IMG:style_emoticons/default/smile.gif) |
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| Bartlett 914 |
Jan 20 2009, 09:22 AM
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#14
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
There is a thread on Roadglue that covers this. I have seen this material and I think this is the best solution. This is as close to the original material as you will get. I don't think RTV is the best because some of these outgas corrosive vapors.
Relay board repair |
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| underthetire |
Jan 20 2009, 10:35 AM
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#15
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Just my 2 cents but usually any silicon has ammonia in it. NOT GOOD FOR TRACES. We use a product called 3 bond for sealing. No ammonia but takes longer to dry. Epoxy once cured is always good. ( PS. i repair CNC equipment, so waterproofing is very important!). (IMG:style_emoticons/default/drunk.gif)
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