Resin and delayed hardener?

[PaulJS]

Does anyone know of a resin or paint where the sticky component can be applied to a surface and then have the hardener sprayed on top?
I'm sceptical that there is such a product, simply because of the difficulties of mixing the two components properly in the correct proportions.
Thanks in advance,
Paul

 

[Rigger Mortice]

Dunno, but what are you trying to do?

 

[oldsaltoz]

You could do the lay up in a very cold area (cold room/freezer)then bring to a warm area to cure.

Good luck and fair winds.

 

[JumbleDuck]

Does anyone know of a resin or paint where the sticky component can be applied to a surface and then have the hardener sprayed on top?
I'm sceptical that there is such a product, simply because of the difficulties of mixing the two components properly in the correct proportions.

Something like that certainly exists. Many years ago I used a two part adhesive with which you assembled everything using one component and then sprayed the second onto the outside. I'm afraid that I can't remember what it was - I was using it in the assembly of cryogenic test rigs, but I'm pretty sure it was on the room temperature side of things. I presume that what was added was a catalyst, rather than a hardener, because there is no way it could have diffused through the joins.

 

[fergie_mac66]

aerolite 300

there are glues like that used for wood .Powder mixed with warm water and applied to one surface the harderned applied to the other sets on contact about 20 mins .Aerolite 300(urea-formaldehyde/acid hardener)

 

[William_H]

Dentists use an epoxy that is hardened by application of UV light. Probably expensive but you may be able to find something similar. As said epoxy is used in prepreg carabon fibre where the fibre is shipped with epoxy already soaked into the mat. It is kept refigerated through shipping and lay up then heated with pressure often in an autoclave to make it harden.
You could try with polyeste resin (with catalyst ie normal as purchased) where you apply MEKP hardener when it is layed up. An excess of hardener may be acceptable if the lay up is already done provided you apply enough hardener to make it harden but not so much as to cause thermal run away. Much experimentation needed and be careful of that MEKP. very dangerous to eyes. good luck olewill

 

[PaulJS]

Thanks for the replies everyone.
Paul

 

[rogerthebodger]

I did a small repair with normal polyester resin a couple months ago that did not cure in normal temperatures due to too little hardener or hardener that had gone off. I placed the component in SWMBO's oven of 70 C and it then cured OK.

Some years ago I worked for a company that used a heat cured polyester sheet moulding compound that was cured in a heated mould.

 

[JumbleDuck]

Some years ago I worked for a company that used a heat cured polyester sheet moulding compound that was cured in a heated mould.

I've used prepreg glass and kevlar. No need to refrigerate - it was just make and bake.