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Repairing A Fiberglass Hood


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#1 lyall ONLINE  

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Posted December 19, 2013 - 02:11 PM

I have several fiberglass hoods for JD 110 and JD 112's that need to be repaired.

 

had to find a good hood to made a mold from

a guy I know just got a JD 140 and the hood is good

he let me use it to make a mold from

 

so this is how I did it

 

put glad wrap on the hood then use spray foam over the glad wrap

it worked but had a lot of bubbles in the foam.

so I had to think what could I do.

 

so I started again

put glad wrap on the hood and paper mached the hood, then dried for ta few days then sprayed foamed it while it was still on the hood.

 

that was a lot better - nice smooth mold 

 

now time to test the mold

 

cleaned a hood and sanded the hood for fiberglassing

put wax paper on the areas of the mold that I am going to repair the hood

clamped the mold to the hood that needs to be fixed.

 

then started fiberglassing, after a day I removed the mold and it look okay, but now I have sum sanding to do

have some air holes that will need to be pudded with bondo.

 

for my first fiberglass repair job - it will work - not the best job - need more practice

sanding and bondo will help

 

I will get some pictures of the mold and a hood that I fixed

 


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#2 backwoods OFFLINE  

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Posted December 19, 2013 - 04:02 PM

By any chance did ya happen to take pics while you were doing this? Coming from an auto body person get some fiber glass filler bondo brand or what ever you find my self i like napa fiber strand. Using fiberglass filler over a fiber glass repair will make sure it is strong an will be weather resistant, just make sure you dont over harden the filler itll be an issue down the road.


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#3 KC9KAS OFFLINE  

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Posted December 19, 2013 - 06:02 PM

Sounds like you put some thought into your mold and repair job.

The spray foam gave it a lot of strength.

Maybe you could have just paper mache-ed the inside of the foam mold from the 1st try.


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#4 lyall ONLINE  

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Posted December 19, 2013 - 07:58 PM

here are some pictures

 

hood 3.JPG

 

hood 2.JPG

 

hood 1.JPG

 

hood 4.JPG

 

now sand it smooth and fill the little hole with bondo

sand the whole hood and prime and panit

 

thanks backwoods for the tip

 

KC9KAS - I thought about using paper mache on the foam, but I thought that is would not be smooth because all the holes in the foam.  putting the  paper mache on the hood sure gives a smooth surface to work with.  Yes the foam on top of the paper mache sure does make the mold strong


Edited by lyall, December 19, 2013 - 08:00 PM.

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#5 oldedeeres OFFLINE  

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Posted December 20, 2013 - 01:29 AM

Thanks for this Lyall, I've got a lot of work to do on the hood of the old stx38 and this will be a great help.


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#6 backwoods OFFLINE  

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Posted December 20, 2013 - 10:10 AM

Never thought of doing a mold like that looks like a good strong mold for a near perfect repair with minimal work after cant wait to see the finished product. Are you painting with rattle cans or base/clear?Remember if your using b/c put a flex additive when you paint since its fiber glass. An a tip for a glass like finish after its in primer block the hood with 320,400,600 dry paper itsll be smooth as glass when your done.


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#7 sodisr OFFLINE  

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Posted December 20, 2013 - 10:12 AM

By any chance did ya happen to take pics while you were doing this? Coming from an auto body person get some fiber glass filler bondo brand or what ever you find my self i like napa fiber strand. Using fiberglass filler over a fiber glass repair will make sure it is strong an will be weather resistant, just make sure you dont over harden the filler itll be an issue down the road.

 

Backwoods ???  What if you under harden the the glass mix ?? I put a patch on my bolens hood scoop,,and it is staying sticky..It's been 2 wks now..can I put another layer over it  ?   What happens if you over harden it ??

 

                                                                                   Thanks  sodi


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#8 backwoods OFFLINE  

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Posted December 20, 2013 - 10:34 AM

Not always but when you go to paint it will dull the area out and it will normally stay softer in that spot.The rule of thumb ive been taught is that for a golf ball amount of filler run 1 bead of harder from on side to the other. The other thing is to make sure you "kneed" or mix the harder up in the tube as well as make sure the filler is mixed you shouldnt see any extra resin when you scoop the filler out that youll be using.Something i just thought of what are the temps your putting the filler on at that also makes a huge difference for painting and filler work 70*f an 50%humidity are ideal conditions since most paints/filler are not designed to work under 70*f.


Edited by backwoods, December 20, 2013 - 10:38 AM.

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#9 sodisr OFFLINE  

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Posted December 20, 2013 - 02:12 PM

The temp may have had something to do with it..It was upper 60s in my basement,,til the wife came home and kicked me and my project out in the cold..The smell can get quite strong in the basement..I'm trying to beef up layers of glass where the hood scoop hold downs are.. they were cracked off.. Now can I go over them with more layers,being still sticky ?  The appearance is the least of my worries..       Thanks    sodi


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#10 backwoods OFFLINE  

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Posted December 20, 2013 - 04:27 PM

sodisr if it was my project i would get all the filler off and start over to insure a quality repair that will last and wont react with paint. the new filler might not stick to the still sticky filler since inbetween coats you should sand it with 60 grit to cuff off the uneven areas and give the next coat something grab ahold of


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#11 Trav1s OFFLINE  

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Posted September 01, 2014 - 10:04 AM

Any suggestions on a 200/300 series hood?  I hope to save its as I believe the early hood is bit different than the later hood.

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Edited by Trav1s, September 01, 2014 - 10:09 AM.


#12 Bolens 1000 OFFLINE  

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Posted September 01, 2014 - 10:14 AM

Looks like the holes are small enough where you can get away with just adding some fiberglass cloth, then sand down.

Have you ever done fiberglass before?



#13 Trav1s OFFLINE  

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Posted September 01, 2014 - 10:23 AM

I have worked with the hood on my 120 but it's a different style.  I am a bit baffled by the complex curves and shapes.  Here is my 120 post repairs:

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#14 Brando OFFLINE  

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Posted September 01, 2014 - 12:34 PM

Your repair job looks good, the 120 hood looks mint as well.I think I'm going to use your mold idea to do a few repairs on a couple hoods I have. Thanks for sharing

#15 dave8338 OFFLINE  

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Posted September 02, 2014 - 05:18 PM

I have worked with the hood on my 120 but it's a different style.  I am a bit baffled by the complex curves and shapes.  Here is my 120 post repairs:

You do nice work, Travis !  VERY nice work, indeed !


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