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Started By
Message
Need help repairing a cracked cowling on an outboard
Posted on 11/3/19 at 5:09 pm
Posted on 11/3/19 at 5:09 pm
Went out to big lake this weekend and discovered that our motor has a crack in the fiberglass cowling. Looking at options for repair and wanted to get any input from the OB who may have done similar repairs. I have already ordered the touch-up kit from ColorRite. My plan is to get some fiberglass tape to sure up the inside of the cowling, then getting some JB weld to put on the outside and then touch up with the paint. It doesn’t have to look great cosmetically, I just want to keep the salt spray out since it’s so hard on components. Crack is about 3 inches in both directions. Any help would be much appreciated.
7
Posted on 11/3/19 at 5:21 pm to Drunken Crawfish
That plan will not work. Been there, done that. 
Got online and found a used one for a couple hundred.
Got online and found a used one for a couple hundred.Posted on 11/3/19 at 5:26 pm to fishfighter
Just out of curiosity, what was the issue with it? I haven’t been able to find a used cowl for the 175 SHO
Posted on 11/3/19 at 5:33 pm to Drunken Crawfish
The cowling is not pure fiberglass. They have some plastic or something that a fiberglass repair just doesn't stick. Now this has been a few years. Maybe you can try. I did buy it off ebay. Call a shop to see what cowls fit in different HP. Motors close to HP size use the same cowling.
Posted on 11/3/19 at 6:26 pm to fishfighter
If it's SMC fiberglass (sheet mold compound), it has a releasing agent in the glass to release from the mold. You must use epoxy resin for it to stick. I fixed a waverunner built from SMC a few years ago and the West Systems epoxy resin has held up like a champ
Posted on 11/3/19 at 6:40 pm to Drunken Crawfish
quote:
Need help repairing a cracked cowling on an outboard
I've also tried to deal with a cracked cowling. I'd do what the others said and find a replacement cowling.
Posted on 11/3/19 at 9:08 pm to GoAwayImBaitn
quote:
If it's SMC fiberglass (sheet mold compound), it has a releasing agent in the glass to release from the mold. You must use epoxy resin for it to stick. I fixed a waverunner built from SMC a few years ago and the West Systems epoxy resin has held up like a champ
Did you use a filler for it? Or was it just straight epoxy mix?
Posted on 11/3/19 at 9:10 pm to Drunken Crawfish
Buy another.
Also, subtle “I can afford a Yamaha” brag.
Also, subtle “I can afford a Yamaha” brag.
Posted on 11/3/19 at 10:00 pm to Eli Goldfinger
quote:
Buy another
Not an option as of now, both due to crazy cost of new and lack of availability for used.
Posted on 11/3/19 at 10:25 pm to Drunken Crawfish
Black Gorilla tape on the crack until you can find a new/used replacement.
Posted on 11/4/19 at 5:42 am to DMAN1968
quote:
Black Gorilla tape on the crack until you can find a new/used replacement.
This is what I was thinking too!
Just put it on the inside.
Posted on 11/4/19 at 5:43 am to Drunken Crawfish
Posted on 11/4/19 at 12:38 pm to Uncle JackD
Clean with acetone then denatured alcohol.
Sand inside and outside
Repair with west system epoxy. The colloidal powder makes the mix thicker and easier to work with, but isnt necessary. Extra glass cloth 9n the inside is likely not necessary but can be used if needed. You can also use a piece of aluminum sheet and alum rivets as a backer plate if you need to force uneven edges to meet up flush. Just epoxy over it when done.
Get a box of nitrile gloves,lots of small throw away containers like xlarg jello shots, and a pack of popsicle sticks before you start.
Use a mask and goggles when sanding. Use a tack cloth between coats to pick up dust, followed by a denatured alcohol wipe.
When you get it the way you want it paint and seal.
Order additional decal if needed to make it look professional.
And get the pumps that come with the west system epoxy makes mixing simple.
Sand inside and outside
Repair with west system epoxy. The colloidal powder makes the mix thicker and easier to work with, but isnt necessary. Extra glass cloth 9n the inside is likely not necessary but can be used if needed. You can also use a piece of aluminum sheet and alum rivets as a backer plate if you need to force uneven edges to meet up flush. Just epoxy over it when done.
Get a box of nitrile gloves,lots of small throw away containers like xlarg jello shots, and a pack of popsicle sticks before you start.
Use a mask and goggles when sanding. Use a tack cloth between coats to pick up dust, followed by a denatured alcohol wipe.
When you get it the way you want it paint and seal.
Order additional decal if needed to make it look professional.
And get the pumps that come with the west system epoxy makes mixing simple.
This post was edited on 11/4/19 at 12:39 pm
Posted on 11/4/19 at 1:07 pm to Bleeding purple
quote:
Get a box of nitrile gloves,lots of small throw away containers like xlarg jello shots, and a pack of popsicle sticks before you start.
This. I have done a good bit of fiberglass work and the Harbor Freight 12 pack of 3" paint brushes for $7.99 are great for one use and toss it fiberglass/resin work.
This post was edited on 11/4/19 at 1:09 pm
Posted on 11/4/19 at 2:15 pm to Bleeding purple
Purp, I'll probably go that route. Going to try to get all my material together and knock it out next week.
Posted on 11/4/19 at 2:38 pm to Drunken Crawfish
Plan to do a little each night. A quality finish takes some time especially if you are a novice and it needs to be completely dry before you sand.
Posted on 11/4/19 at 2:54 pm to Drunken Crawfish
Posted on 11/4/19 at 4:27 pm to Bleeding purple
quote:
it needs to be completely dry before you sand.
This...for sure. Also, temperature matters. The colder it is the longer it takes to cure. Don't rush it...it won't be a one day-done deal job.
Posted on 11/4/19 at 5:25 pm to Drunken Crawfish
Drill hole at each end of the crack
Go to wall mart get fiberglass mat tape and resin & hardner mix resin apply to both sides of the crack apply Fiberglass tape or Mat then coat the fiberglass with resin with a cheep brush let dry sand and re apply until smooth it’s like drywall repair just fill sand fill sand fill paint
Go to wall mart get fiberglass mat tape and resin & hardner mix resin apply to both sides of the crack apply Fiberglass tape or Mat then coat the fiberglass with resin with a cheep brush let dry sand and re apply until smooth it’s like drywall repair just fill sand fill sand fill paint
Posted on 11/4/19 at 5:52 pm to Drunken Crawfish
quote:
I haven’t been able to find a used cowl for the 175 SHO
there are some here, but definately not cheap, not sure if its what you need
LINK
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