OT somewhat Frame coating help
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Posting Guru
Joined: Jul 2012
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From: Southern SC.
OT somewhat Frame coating help
I hope someone can help this forgetful old guy. A friend has a boat in SC the trailer is aluminum but has 4 galvanized cross members. The salt water has pretty well destroyed them and he has new ones to put in. My question is would it be wise to coat them with "POR 15" (part of my problem is I can't remember if that is what it is called) or would the salt water just eat it away? If that doesn't work does any one have any other ideas? Thanks Dave S
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Posting Guru
Joined: Jul 2012
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From: Southern SC.
Thanks Dave. I just checked internet and it does say good for marine use but nothing about salt water. Hopefully someone may know. Thanks again for confirming it is called POR15
Laughing Gas
Joined: Mar 2004
Posts: 989
Likes: 113
From: australia
If the new cross members are galvanised , I don't see the need to paint them .
If they have had holes drilled in them then been hot dipped in gal , they should be well enough protected already .
If they have had holes drilled in them then been hot dipped in gal , they should be well enough protected already .
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From: Southern SC.
Scott the old ones were galvanized and they were really in bad shape. I didn't think that would happen. That is the only reason I thought of using this. Maybe he is wrong and they are just plain steel.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
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From: Northville, MI
If they are galvanized then they are probably steel. Hopefully they are U channel and not boxed. The issue with fully boxed cross members is that it is hard to coat all the nooks and crannies inside. I had a boat trailer that I used to launch in salt water all the time. The paint was peeling when I bought it so I used a professional sandblasted to strip it. Then I immediately spray painted it with a red, water soluble rust resistant paint/primer. It had no gloss to it but in the 10 years that I owned it I never had any rust on the frame. But it had U channels not boxed.
The other issue is if you store the boat and trailer at a boatyard the salt air will really eat through most anything. I always thoroughly rinsed my boat and trailer with fresh water after use and stored it at my house that was 15 miles inland from the launch ramps that I used.
The other issue is if you store the boat and trailer at a boatyard the salt air will really eat through most anything. I always thoroughly rinsed my boat and trailer with fresh water after use and stored it at my house that was 15 miles inland from the launch ramps that I used.
Lead Driver
Joined: Aug 2006
Posts: 8,094
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From: Brentwood, TN
I prefer KBS Rust Seal over POR15 for a number of reasons but here is a link to their website https://www.kbs-coatings.com/rustseal.html so that you can determine for yourself if this product will meet your needs.
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Posting Guru
Joined: Jul 2012
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From: Southern SC.
Thanks guys. I will pass the info on. He bought it used and the old ones were boxed. The new are u channels. He does store it about 10 miles inland and is careful to rinse it. The damage was done before he got it. Thanks again.
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Mountain Pass
Joined: Jan 2010
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From: essex, CT
POR-15 is the right product. I can tell you that I have used to coat the exterior of an aluminum fuel tank that I have in a sailboat, its been there 15 years.
As always, it's all in the prep. Sanding to scratch the surface followed by following the instructions.
As always, it's all in the prep. Sanding to scratch the surface followed by following the instructions.
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Posting Guru
Joined: Jul 2012
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From: Southern SC.
Thanks guys. He is looking for POR15 in SC as I write this. Going to rough sand the braces and put it on before he assembles to trailer then do touch up. Again thanks for your help. Dave S
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