I'm pretty certain if pre-preg made the best product, thats what Lockheed would be using on their 388 Billion dollar JSF project. The F-22 Raptor and Joint Strike Fighter are made from hand laid carbon-carbon composite. Pre-preg may be the fastest and easiest for a beginner to consistently and repeatedly lay, but it is significantly higher in cost to purchase as material, significantly more expensive to cure (requires an autoclave), no stronger than a properly hand laid composite, and is significantly more prone to conditions that lead to delamitation. I suppose you could also wipe a bead of sealant or silicone around the perimeter once it's on. If you use a bonding agent, then just make sure you put a bead all the way around the perimeter that makes contact with the firewall all the way around. If you attach it with screws, it is highly recommended that you use a sealant like that tar-like strip sealer aroung the perimeter so that fumes from the engine compartment don't find their way into the passenger compartment. You would need to loosen all the bolts and remove the ones that you need to sneak past on the firewall. If you loosen your fenders enough, you should be able to slide them forward enough to slide our piece past the mounting flanges that attach to the firewall. As far as lining it up on your firewall, it pretty much is self aligning with the contours on a stock firewall. Same goes with anything else you want to mount to it. That way you don't need to use any spacers or washers. the easier route would be to use the screws in the flat areas in the corners of the raised ribs. You may want to put some spacers or washers behind the raised areas of our cover, so as to not crush it. Personally, I think some nice stainless button head screws would make it pop. It may be mounted using hardware of your choice (most likely, stainless), or it can be bonded right to your firewall using a panel bond adhesive or a really good epoxy. I designed it to fit both the stock and the DSE wiper motors. Do I need to remove front clip/fenders, or can I just unbolt and slide the clipforward a couple of inches? Regarding the firewall cover, do you have installation instructions? How do you recommend attaching it to the firewall? Also, I'll be installing a Vintage Air system, so do I need to install VA's plate to cover up the AC opening first (original AC model)? What about windshield wiper motor (I have a DSE wiper kit).
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