32 replies to this topic

[bigtonyicu]

It essentially renders them water proof, so that any large displays done with them can only be tarped up with no danger of mortars failing due to them getting wet, in light rain, and causing surrounding mortars to fail as a result.

[Shake]

If that's the case wouldn't a simple varnish/wood sealant work?

Not trying to be difficult here but just looking at the simpliest method available.

[bigtonyicu]

varnish burns and flakes off

Edited by bigtonyicu, 29 July 2008 - 04:32 PM.

[starseeker]

varnish burns and flakes off

Thompsons waterseal does the job nicely,

[BrightStar]

While we're on the subject of treating paper tubes, our American friends often talk about 'Minwax Wood Hardener'. They seem to use it universally for rockets, gerbs etc.

Is there an equivalent product in the UK? What exactly does it do?

Edited by BrightStar, 29 July 2008 - 08:19 PM.

[Bonny]

That would bring some unwated attention, now a days why raise flags in you don't have to lol

I'm of the same train of thought. I have priced mortars in USA, but have not ordered yet.

[bigtonyicu]

While we're on the subject of treating paper tubes, our American friends often talk about 'Minwax Wood Hardener'. They seem to use it universally for rockets, gerbs etc.

Is there an equivalent product in the UK? What exactly does it do?

I don't know about the UK put a recently treated a few tubes with it, and I wouldn't use it on mortars, it increases the strength but makes the tubes very hard, just about brittle, I'd be afraid of the shrapnel produced if a shell failed and the mortar blew up.

[bigtonyicu]

Thompsons waterseal does the job nicely,

Does it really protect the tube? I now it does a great job on wood but I would have thought a tube would have to be left in there fairly long (it's very diluted) and I feared all that soaking would make the tubes fall apart.

[pyrotrev]

Do you know of any suitable resins for this procedure?

Maybe a thermosetting phenolic? Soak the tube in a reasonably dilute solution to give good penetration, dry, then bake at 150deg to cure.

[bigtonyicu]

Maybe a thermosetting phenolic? Soak the tube in a reasonably dilute solution to give good penetration, dry, then bake at 150deg to cure.

What would you use for a Solvent?

Edited by bigtonyicu, 30 July 2008 - 12:17 PM.

[starseeker]

Does it really protect the tube? I now it does a great job on wood but I would have thought a tube would have to be left in there fairly long (it's very diluted) and I feared all that soaking would make the tubes fall apart.

I just make sure that when i have coated them thouroughly i put them up side down somewhere warm.

[starseeker]

While we're on the subject of treating paper tubes, our American friends often talk about 'Minwax Wood Hardener'. They seem to use it universally for rockets, gerbs etc.

Is there an equivalent product in the UK? What exactly does it do?

I think ronseal do a woodhardener,it is used to stabilise rotten timber before filling and painting,( windows etc ).It is available at most good trade ,diy stores.

[pyrotrev]

What would you use for a Solvent?

Some (resol resins) are reasonably water soluble. They can also be obtained dissolved in organic solvents. The great thing about phenolics is that they char to a form or vireous carbon that is tough and fairly fire resistant - hence they're used in things like heat shields on rockets.

Edited by pyrotrev, 31 July 2008 - 12:31 PM.

[bigtonyicu]

Some (resol resins) are reasonably water soluble. They can also be obtained dissolved in organic solvents. The great thing about phenolics is that they char to a form or vireous carbon that is tough and fairly fire resistant - hence they're used in things like heat shields on rockets.

Would you happen to know of a brand name for this product after googling "Phenolic Resol Resin", I can find very little information on it, and even less on sources to buy.

[Bonny]

Would you happen to know of a brand name for this product after googling "Phenolic Resol Resin", I can find very little information on it, and even less on sources to buy.

There is a gent that uses (DAP brand) to bind comets, see here:
http://www.apcforum....?showtopic=1313