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Forum Home > General Discussion > How to fix Fiberglass dings?

bluedawg
Member
Posts: 25

Does anyone know how to fix dings in Fiberglass? Just bought a '73 Open bow tri hull MFG... lots of dings and deep scratches. Can I fix?

-Mary

August 31, 2012 at 2:11 PM Flag Quote & Reply

MarkS
Member
Posts: 39

You sure can Mary, all it takes is a little practice and some patience.  I'm no expert, but some folks who are helped guide me through it on a recent project.  First thing to figure out is if they are cosmetic or structural.  (ie: are they just in the gel coat outer coating, or do they go down into the layers of the cloth of the fiberglass)?  If you could post some pics, it would be most helpful to assist.

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Mark S

August 31, 2012 at 2:33 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

I will go down now and take some photos....

August 31, 2012 at 4:37 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

Here's some Pivs - Several are through to the stuff underneath - I think you can see from the pictures. Also would like to remove the black paint from arounf windshield...

 

http://www.bluedawg.com/Boat/back_Left.png

http://www.bluedawg.com/Boat/bad_scratch_2.png

http://www.bluedawg.com/Boat/bad_Scratch.png

http://www.bluedawg.com/Boat/int.png

http://www.bluedawg.com/Boat/stern.png

http://www.bluedawg.com/Boat/stern2.png

http://www.bluedawg.com/Boat/tri_hull.png

http://www.bluedawg.com/Boat/Windshield_Paint.png

http://www.bluedawg.com/Boat/Left_Front.png


August 31, 2012 at 5:11 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

I think the last one "Left_Front" and "Bad Scratch" are the worst.

August 31, 2012 at 5:13 PM Flag Quote & Reply

glassicsonline
Site Owner
Posts: 49
Those are pretty much just cosmetic, nothing structural there from what I can see. The deeper scratches may need to be ground out a little around the edges to get to solid material, then just fill with kitty hair. File with a rasp as it cures and hit it with some filler. Block sand and hit again with filler if necessary. Touch up/paint. Now, if you are doing a full re-paint, there will be a lot more prep work involved, that's another story.
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Dave

August 31, 2012 at 10:55 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

Hi Dave, I am very new to this - could you define ebrthignf or me... What is Kitty Hair? I can go to the hardware store and get a rasp - what exeactly should I ask for. What is Filler? Is there somewhere online to order boat touch up paint?

Thank a million. As you can see I am lost without your help! 

--

http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 1, 2012 at 8:51 AM Flag Quote & Reply

bluedawg
Member
Posts: 25

LOL - and by "ebrthignf" I meant everything - don't know what happened to my typing there.

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http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 1, 2012 at 8:52 AM Flag Quote & Reply

bluedawg
Member
Posts: 25

OK, I found Kitty Hair on Amazon.  I see it is a filler which brings me to my next question... YOu say to Fill with Kitty Hair File and then "Hit it with some filler". Isn't Kitty hair a filler? Or for this last step do I use a different filler? Also please, what type of rasp?

--

http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 1, 2012 at 11:28 AM Flag Quote & Reply

glassicsonline
Site Owner
Posts: 49

Here is a decent video that shows a repair a little deeper than yours:

http://www.youtube.com/watch?v=eggAzL9oQxg&feature=related

You don't have to worry about the fiberglass part if your scratches are just in the gel coat.

Kitty hair is just a course filler for larger repairs. You would use regular filler for finishing repairs. You use the rasp on the kitty hair since if is very course and you don't want it sticking up too high. It is tougher to sand, so the rasp works best. You don't have to wait for it to cure all the way either since it cures really quick and it's easier to cut with the rasp before it cures. finish the repair with the lighter weight filler to get it flush. There are lot's of how to videos on YouTube.

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Dave

September 2, 2012 at 1:17 AM Flag Quote & Reply

bluedawg
Member
Posts: 25

Ok. Thanks!


--

http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 2, 2012 at 3:37 AM Flag Quote & Reply

bluedawg
Member
Posts: 25

I watched a bunch of you tube videos. Would this be what I could use as the lighter weight filler? : EVERCOAT - Polyester Gel-Paste


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http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 2, 2012 at 11:31 AM Flag Quote & Reply

glassicsonline
Site Owner
Posts: 49

Looks like it will work, probably overpriced if you are going to paint over it. This product looks like it can be tinted for a gel coat like finish....

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Dave

September 2, 2012 at 4:13 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

Yes, I bought seperate tubes of tint to go with it. I can't wait to get everythign and start plugging up holes! There are lots of holes around the boat where they must have had stuff mounted on like a trolling motor mount right on the front bow that I removed today. That left three 1/4 inch round holes in the bow - I can plug them up with the same process, Yes? I thought I'd just put some duct tape on the backside of the hole (I have access through a large hole in the inside of the tri-hull stern) then fill with kitty hair etc...

--

http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 2, 2012 at 5:18 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

What grades of sandpaper do you use to finish?


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http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 2, 2012 at 5:18 PM Flag Quote & Reply

glassicsonline
Site Owner
Posts: 49

Sanding is an art form in it's own right. You want to use a course enough grade to cut, but not so course that you leave deep gouges. Start with around 200 for finishing,use a light touch and let the sandpaper do the work. Before you start to get to the level of the surrounding finish, switch to the next grade down, maybe 320 before you start to leave scratches in the finish. Follow with 600, then finally 1500. Some times a sanding sponge will be necessary for compound curves. To get things really flat and smooth, you may need to use something called a guide coat. This mainly applies to a full repaint though, not so much for small repairs. Not familiar with the product you are using, so if it's like gel coat repair, you will want to get it close and blend/buff the finish to match the surrounding area. Once you get done sanding, there are different grades of buffing compound if you want to get the finish really nice and shiny. Good news is you'll be an expert by the time you are done. :)

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Dave

September 4, 2012 at 10:07 PM Flag Quote & Reply

glassicsonline
Site Owner
Posts: 49

bluedawg at September 2, 2012 at 5:18 PM

Yes, I bought seperate tubes of tint to go with it. I can't wait to get everythign and start plugging up holes! There are lots of holes around the boat where they must have had stuff mounted on like a trolling motor mount right on the front bow that I removed today. That left three 1/4 inch round holes in the bow - I can plug them up with the same process, Yes? I thought I'd just put some duct tape on the backside of the hole (I have access through a large hole in the inside of the tri-hull stern) then fill with kitty hair etc...

BTW, if you are going to be filling holes that go all the way through, these are structural repairs and you will need to grind them out and fill with mat and cloth, (or just cloth if you are using epoxy). I would suggest regular or vinyl-ester resin if you are finishing with the gel type finish you have indicated. This is a pretty decent video, don't worry about cutting out a large area, this works for small holes too:

http://www.youtube.com/watch?v=SsoKAHU5xUw

 

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Dave

September 4, 2012 at 10:48 PM Flag Quote & Reply

bluedawg
Member
Posts: 25

If they are just 1/4" bolt holes do you still think it necessary to do fiberglass cloth and all? I thought I would just fill with kitty hair... I just don't want water going down in the hull when waves splash up and over.. But then I guess I'll need to fix the big one on the inside front. That's pretty important right  - Keeping water out of the interior? Or will it all just flow to the back and out he bilge hole?

--

http://www.bluedawg.com

Fata volentem ducunt, trahunt nolentem. [Whoever is willing the Fates will lead, the unwilling they will drag along.]

September 5, 2012 at 10:15 AM Flag Quote & Reply

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