some basic fiberglassing questions

[bastianak 10+ year member]

hello im in the process of my first fiberglass box for my r type 12s and i have 7 layers at the moment using 1.5 oz. matt i was wondering how many more i should add its preddy **** stiff as it is and ive seen that most people use around 7 layers but ide like anyones opinion! thanksalot!

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[svtlightning93 10+ year member]

For flat areas you need more because it will tend to flex, for rounded areas you can go with less and have the same strength. I believe 1/4 inch of fiberglass is equivelent to 3/4 inch mdf. Not sure how many layers it takes to achieve 1/4 inch though. The more the better and the stronger it will be. It will also sound better.

 

[Gauntlet 5,000+ posts]

Depends on the shape of the fiberglass and how big it is....but 7 should be fine....although it never hurts to had another layer or 2. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[req 5,000+ posts]

might hurt his wallet depending on how old he is =)

if ya wanna, just make some kinda support from top to bottom inside if there are large flat pieces. they do tend to flex alot. i put down ~5 layers for my kick panels, and they are stiff as all hell.

i think you should be fine with 7~8 layers on large flat areas, and 4~6 on smaller- curvy areas.

dont forget, if the sub is in, and its flexing a little. you can always add more after your done!

 

[ramos 5,000+ posts]

You need to take into account what weight mat and or cloth your using too. When i build sub enclosures, I usually only use two to three layers. But I'm using 17 oz. kyntex biaxial, two layers and my fat a$$ can jump up and down on it. Three layers and you can park a car on it. //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif But with 1.5oz mat seven layers should be sufficient. If you still have flexing, resin in some strips of rope for some ribs. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[immaculateaudio 10+ year member]

7 Layers Of Chop Matte Is More Than Enough... Top It All Off With A Layer Of Duraglass Though!... Knock That Down And Then Apply Your Plastic; If U Are Prepping For Paint. Of Course!