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How To: Fabrication of my second hood, Part 3


mistapickles
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http://www.starquestclub.com/forum/index.php?showtopic=123462 How to Part 1

http://www.starquestclub.com/forum/index.php?showtopic=127779 How to Part 2

 

 

Now we start the bodywork...remember how I said don't do solid welds to keep from warping the hood and in the mean time you are looking at gaps between the welds wondering what's next....This is what's next, fiberglass filler. It's water proof and it's tough as your mom's baked chicken...With that being said, it is not bondo regular filler. With the vibration that happen's driving, opening and closing the hood etc, regular bondo will crack, also, once you sand regular bondo it is no longer waterproof leaving you available to rust under your filler. The good thing about regular bondo is it is easy to sand, which is the exact opposite of fiberglass filler, imagine sanding a cinder block with 120 grit sand paper and you get the effect of sanding fiberglass filler with 40 grit. Any brand fiberglass filler will do, MarGlass, Bondo Glass, etc

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00765-20120222-1550.jpg

Next spread the filler over the seams, making sure to press it down into the gaps. I put on gloves and spread it with my finger. The more hardener you put in the filler the faster it cures, so put the bare minimum in so you have time to spread it. Mine are going to look like this, you might not want the rounded corner, that's fine as long as you are sure to push the filler into the gaps. Once again, fiberglass filler is water proof, if you want to keep water out of the crevices and pockets you've created, thus keep rust out, make sure you have a good seal with this. While it is soft make close to the shape you want it to be, but not perfect, make it perfect with regular filler, it sands easier.

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00766-20120222-1619.jpg

Edited by mistapickles
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An old body guy recently showed me a trick with dealing with shaping FG filler that has saved me a bunch of time, especially when you have to have thick FG and and contours that are hard to form by just spreading the FG. There is a "sweet spot" during the curing time of FG filler where it is too hard to spread anymore, but not fully hard from being fully cured. At this point you can hit it with some 36 or 40 grit and it sands down super fast- even easier than sanding fully cured plastic filler. There's only about a 3-5 minute window to do this- If you do it too early, you could possibly end up peeling the FG filler off, and if you wait too long, you'll be sanding a brick like mistapikles said. The cool thing is that after you have the FG filler down to the contour you want and let it fully cure, you can come right back over it with bondo because you've already got sanding scratches in the FG to give the bondo something to bite into.
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Depending on what you're doing with your hood, sand the fiberglass filler to the general shape you want it to be. If it's close enough to the shape you want and it doesn't need to be pretty (function over form) leave it the way it is. The more fiberglass you have on there the stronger it will be. Keep in mind if you have done your button welds correctly with the amount of fiberglass shown, your hood is more rigid than factory. I'm sanding mine, the meanest is always the cleanest...

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00792-20120227-1432.jpg

This filler doesn't have to be super thick to perform, but it does need at least an 1/8" material to prevent cracking under flexing. if this doesn't flex and crack, neither will the bondo you will put over top it, so don't sand it too thin or too close to the actual shape you want it to be.

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00793-20120227-1433.jpg

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now for the fun part...use an angle grinder to shape the visible side of your hood, the smaller the disk the better

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00804-20120229-1632.jpg

make sure you are completely even with edge you are grinding, this will make beautiful 90 degree corners for you, and out of fiberglass filler. You don't want to make your corners out of bondo, first it cracks and loses it's edge pretty quickly. If you have an edge made of fiberglass it may as well be metal, so take your time and make sure the grinder is flat with what you are sanding...

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00805-20120229-1632.jpg

see how perfect this corner is?

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00806-20120229-1637.jpg

if you find you have any nicks or the corner isn't the way you like, grind the edge, put more fiberglass filler and try again...we're very close to being finished with the body work...

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00807-20120229-1638.jpg

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  • 2 weeks later...

there are other plastic fillers on the planet, but this is my favorite, it could be your favorite too...

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00838-20120311-1937-1.jpg

Whatever your brand, mix it up, put some latex gloves on and spread it smoothly into the corner, this stuff feels like cake frosting so shape it as close to the shape you want it as possible.

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00840-20120311-1943.jpg

http://i383.photobucket.com/albums/oo278/mistapickles/IMG00839-20120311-1943.jpg

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