Can this be used on a engine cover/dog house on a inboard outboard boat

I can't speak for your I/O boat but I used it in my van's engine cover which gets really hot and have had no problem what so ever. Good luck.

Is there enough material to cover two doors

Not unless you have really small doors. The better way to do it is with the "door kit". It consists of 4pcs of 12"x36" and is made for 2 doors. What ever you don't use on the inner door skin you should use on the outer door skin. And don't forget directly behind the speaker. I used 36 sq ft on a 04 f150 with the doors and rear wall including back floor where the dual subs are.

how many sheet would you use for 4 car speaker?

Hi Thank you for the question, and it really depends on how much you want to spend.For example, "I" would use just one of these 32x18 sheets for one door. Applying to the outer door inner panel as well as the door panel for the speaker.This way you will not loose your music to the car next to you, or entertaining everybody you pass.You may look into getting 4 boxes of these and do that, or you can get (2) two door speaker kits (12X12).I would recommend the full coverage for medium to high powered audio systems. Especially if your vehicle is Honda , Toyota, or where the sheet metal is super thin.Thank you for choosing the Wires Zone.

How does it hold up when it gets wet regularly? My jeep leaks...

Water does not effect dynamat at all. Once installed it sticks very well to the metal surface of your vehicle. Just make sure the edges are pressed down well so water can’t seep under it and start the rusting process on your Jeep. Clean the surface well before putting the Dynamat down so it sticks.

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🔇 Silence is the new luxury — upgrade your ride’s vibe now!

GENEROUS COVERAGE - Large 18x32 inch sheets cover more surface area, reducing installation time.
ULTIMATE NOISE CONTROL - Slash unwanted vibrations and road noise with precision-engineered thickness.
BONUS XTREME WEDGE PACK - Includes specialized wedges for tight spots, ensuring full-spectrum sound deadening.
LIGHTWEIGHT YET DURABLE - At just 1 pound, it adds soundproofing without bulk or weight penalty.
PEEL STICK SIMPLICITY - Self-adhesive backing ensures a hassle-free, bubble-free application every time.

Dynamat 10425 is a high-performance, 0.067-inch thick self-adhesive sound deadener measuring 18 by 32 inches. Designed to reduce noise and vibrations, it features a durable rubber material and includes an Xtreme Wedge Pack for enhanced installation in hard-to-reach areas. Lightweight and easy to apply, it’s the go-to solution for professionals and enthusiasts seeking premium acoustic control.

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Batteries Included	No
Batteries Required	No
Brand	Dynamat
Manufacturer	Dynamat
Item Model Number	10425
Material	ゴム
Product Dimensions	55.88 x 12.7 x 7.62 cm; 453.59 g
Item Weight	454 g

Dynamat 10425 18 x 32 x 0.067 Thick Self-Adhesive Sound Deadener with Xtreme Wedge Pack by Dynamat

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