# Anyone have experience with fiberglass?

**URL:** <https://forums.speedlife.net/t/anyone-have-experience-with-fiberglass/16956>\
**Category:** NYSpeed Automotive\
**Created:** [September 4, 2006, 7:34pm UTC](https://forums.speedlife.net/t/anyone-have-experience-with-fiberglass/16956 "2006-09-04T19:34:54Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![fairgentleman\_Z](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fairgentleman_z/32/7263_2.png) [@fairgentleman\_Z](https://forums.speedlife.net/u/fairgentleman_Z)\
**Post date:** [September 5, 2006, 3:43pm UTC](https://forums.speedlife.net/t/anyone-have-experience-with-fiberglass/16956/21 "2006-09-05T15:43:29Z")

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> [@LAFENGAS](#):
>
> Why? because fiberglass if very heavy when hand laid (high resin/fiberglass ratio) Unless you have a vacuum bagging system will you be able to make it reasonably lightweight. Vacuum bagging requires a fair amount of mold experience to understand how your mold and plug behave under vacuum. Now you’re just opening a can of worms.

What exactly does the vacuum bag do?

Just sucks all the air out and puts 1 atm evenly over the whole peice, thus requiring less adhesive (epoxy/resin) to bond the layers?

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