Bondo fiber glass resin + aluminum

[Sticky_Tape]

It seems that when I try to make casting from cpvc to aluminum the aluminum barrel slips out of the casting I roughened up the barrel for casting but it wouldn't work any ideas. BTW I got the mix right 12 drops per oz. resin - 3 drops 1/4 oz. resin.

[jrrdw]

It seems that when I try to make casting from cpvc to aluminum the aluminum barrel slips out of the casting I roughened up the barrel for casting but it wouldn't work any ideas. BTW I got the mix right 12 drops per oz. resin - 3 drops 1/4 oz. resin.

Stud the barrel.

Drill holes, tap the holes, then screw in machine screws with Loctite on the threads, then cast it.

Why are you using Bondo fiber glass resin?

[Sticky_Tape]

Why are you using Bondo fiber glass resin?

What's wrong with it? btw I woud reather just do the more simple cast.

[jrrdw]

It's designed to work with steel and anything made of fiber glass, nothing else that I know of.

[Sticky_Tape]

Oh ok * walks away *

[jackssmirkingrevenge]

how did you roughen up the barrel? Just a light sanding? If so, try repeated file marks or saw cuts, not enough to go through the barrel though of course.

[Gippeto]

The problem could be that epoxies and fibreglass resins create heat when curing.

Aluminum has a fairly high coefficient of expansion.

Simply put, this means it grows when heated.

If it "grows" while the epoxy is curing, then the epoxy cures with a larger hole in it, and your aluminum tube does not stay put.

Try JB weld.

[jook13]

I agree with gippeto... I have used jb weld on aluminum and had no problems.

[jackssmirkingrevenge]

I've epoxied aluminium tubing before successfully, I doubt thermal expansion is a real factor here.