Hey everyone
I had a quick question, I'm doing some modification and buildup of materials on my front and rear bumper to match the rest of the car... As we know the bumpers are probably one of the most flexible parts of the car.

So my question is... when building up a surface (several layers up to 1" thick) what is the best thing to use?
should I build up with a basic bondo-glass mixed filler? a straight bondo filler, or go with a more flexible and more expensive filler?
or should i go with a straight glass build and just use several layers of fiberglass?

[edit] Also, for those of you who have bonded on a cowl hood to your fiero? what did you use and how long has it lasted?

Thanks
I'll be posting pics of my mods in my buildup thread

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[This message has been edited by Nebiros88 (edited 08-09-2004).]

I don't think I'd really want any filler up to 1" thick. Your best bet would be to get the near-shape with another material first (even cardbord to create surfaces), then fill edges with a urethane filler (a "Flexible Bumper Repair Kit" from the local shops will usually do).

You can also use "pieces" from other urethane panels to help keep things flexible and stronger. I've also used the urethane filler with fiberglass to reinforce things in the past. I've even got a torn up front fascia for that very reason (if I ever need donor parts for a bumper project).

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Looking for Fiero posters?

Never thought of that... thanks Minn.

Any suggestions of the type of epoxy or filler to use on bonding and blending in a cowl scoop to the hood?
I know a while back Ski had troubles with his having hairline cracks and I dont want to go through the hassle of getting it all done and painted and then the darn thing crack apart on me... perhaps ski will chime in with whats working for him now

[This message has been edited by Nebiros88 (edited 08-09-2004).]

After struggling with my deck scoop and some hairline cracks (thankfully prior to the final painting) - I've definitely found that it's best to put at least a couple of layers of fiberglass over the "seam". Then fill & smooth over that. I haven't had any trouble with my Deck Scoop, the only thing about this is that your transition area is generally a bit larger than if you just used filler alone.

Oh yeah, for filler - be sure to get something that specifically states that it's compatible with SMC (I generally use "Duramix/3M" brand, although "Evercoat" also comes very highly recommended by many people.

front and rear decklids usually work fine with fiberglass and filler. But if you want to do major/smooth mods to the front/rearbumper that will hold up without cracking: you better get some spares, make the shapes (using foam, cardboard, whatever), take a (rough) mold and finish a onepiece(one material) product. Its a lot of work but thats what I learned after making several mistakes....mixing different kinds of plastics will cause trouble...most likely after painting