[woodturner2]

What is the best material to use to mold a fiberglass hood scoop to a metal hood?

[jcoby]

to make the mold or the scoop? or to bond the scoop to the hood? what are you asking?

[woodturner2]

I am going to glue the scoop to the hood with two part urethane adhesive. I need to know what to use to mold it to the hood with.

[jcoby]

there are two ways of making something out of fiberglass: molded and moldless. which are you going for?

[woodturner2]

I dont want to make a scoop I am going to glue one that is already made to the hood and I want to know what type of material to use to mold it to the metal hood.

[wildthing]

i think hes asking best way to bond the scoup to the hood and then blend it so it appears to be all one piece.

[woodturner2]

Thanks Wildthing that is exactly what I am asking.

[Pony]

Biggest problem seems to be heat and vibration. Most people use bondo to mold the scoop in and it winds up cracking within a short time. The steel,fiberglass and bondo all react differently and seem to doom the project. Hopefully someone here knows a better way. I wish I did too.

[moontanker]

Hey guys .Ever heard of pop rivets? A ny hardware store hs em.Have fun....

[woodturner2]

I found out on another forum to use Dyna-Weld as it flexes and go over it with flexibal polyester putty.

[Eric64]

Ther was an article in the last couple of months in either Classic Truck or Custom Classic Trucks, They were using a product made by SEM and it was intended for this use and supposedly won't crack with the flexing. It was a late 50's early 60's Ford pick-up one of their project vehicles and they were showing how to mold in a hood scoop.

[woodturner2]

Thanks Eric64 I will try to check that out.

[julioDBS]

I am using a marine deck plank resin to bond my scoops to my steel hoods.
I mount mine from underneath the hood using the wide flanges on the scoop for a wide attachment area. No problems in 3 years with a half dozen completed and installed hoods. A clean and properly prepped bond area on the steel hood and fiberglass scoop are part of the procedure.
Here's one pic, not the best quality, but one I had handy.

[Chevrolet4x4s]

What scoop

Shane

[sunsetdart]

I always take the time to line up the scoop where I want it. Then drill 1/8" holes for pop rivets. You want to use enough to pull the scoop tight but not too many so you can't get them all in in time. After all holes are in, grind the area on the metal hood to bare steel. Also take the time to rough up the area on the scoop that attaches to the steel.
Now you mix up some tiger hair and apply to both the hood and the scoop. Then start putting in the pop rivets to pull it tight to the steel hood. Afetr the tiger hair sets up...drill out the rivets. Then grind the area getting off the sharp pieces. Now you can start laying down fiberglass mat over the ares where the rivets were. The use bondo to smooth the rest. I have done fender flares and hood scoops like this for years and have never had one crack. It does take alot more time to do it this way but it's worth it in the end.