Epoxy or polyester resin for sub box?

ksagis · 11-26-2013, 11:24 AM

Folks, are people using epoxy or polyester resin to make their sub boxes? Ignoring things like drying time, costs, etc, it looks like the polyester resins are more brittle which may not be desirable. However, I'm also told that epoxy resins get soft at about 140 degrees which seems undesirable when the car is sitting in hot sun.

So, what are other peoples choices for resin and why did they go that way? Also, how many layers of cloth were used, 12 or so?

BTW, I was looking at the US Composites lines of resins.

37Z · 12-03-2013, 01:04 PM

Quote:

Originally Posted by ksagis

Folks, are people using epoxy or polyester resin to make their sub boxes? Ignoring things like drying time, costs, etc, it looks like the polyester resins are more brittle which may not be desirable. However, I'm also told that epoxy resins get soft at about 140 degrees which seems undesirable when the car is sitting in hot sun.

So, what are other peoples choices for resin and why did they go that way? Also, how many layers of cloth were used, 12 or so?

BTW, I was looking at the US Composites lines of resins.

Either resin is ok for a sub box. Best to check the resin date since they have a shelf life. 3 layers of cloth is needed unless you are creating a composite core (i.e. basa core). Get a good roller to get the air bubbles out.

YzGyz · 12-05-2013, 03:25 AM

I think I did something like 5 layers of glass on my box. I'm no pro though. Heck, it was actually my first time working with he stuff. Kinda hard but I know I can do a lot better next time. The fiberglass was solid after completely setting up. My fiberglass box had lot's of imperfections so I spread body bondo all over the box. This further added strengthening to the already solid structure. My box sounded like steel when I rapped it with my knuckles. Overboard? probably but I wanted it solid as solid can be. I wanted to make sure my bass BOOMED!

11-26-2013, 11:24 AM	#1 (permalink)
ksagis Base Member Join Date: Oct 2013 Location: LA Posts: 88 Drives: 370Z Roadster Rep Power: 12	Epoxy or polyester resin for sub box? Folks, are people using epoxy or polyester resin to make their sub boxes? Ignoring things like drying time, costs, etc, it looks like the polyester resins are more brittle which may not be desirable. However, I'm also told that epoxy resins get soft at about 140 degrees which seems undesirable when the car is sitting in hot sun. So, what are other peoples choices for resin and why did they go that way? Also, how many layers of cloth were used, 12 or so? BTW, I was looking at the US Composites lines of resins. Last edited by ksagis; 11-26-2013 at 01:37 PM.

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12-05-2013, 03:25 AM	#3 (permalink)
YzGyz A True Z Fanatic Join Date: Jun 2013 Location: Houston Posts: 1,449 Drives: 2010 Nismo Rep Power: 63	I think I did something like 5 layers of glass on my box. I'm no pro though. Heck, it was actually my first time working with he stuff. Kinda hard but I know I can do a lot better next time. The fiberglass was solid after completely setting up. My fiberglass box had lot's of imperfections so I spread body bondo all over the box. This further added strengthening to the already solid structure. My box sounded like steel when I rapped it with my knuckles. Overboard? probably but I wanted it solid as solid can be. I wanted to make sure my bass BOOMED!