• Thanks for visiting The Penturners Forum today.

    There are many features and resources that currently you are unable to see or access, either because you're not yet registered, or if you're already registered, because you're not logged in.

    To gain full access to the forum, please log in or register now. Registration is completely free, it only takes a few seconds, and you can join our well established community of like-minded pen makers.

Polyester resin.

fortress

Registered
Joined
Apr 11, 2016
Posts
5,178
Location
Astley
First Name
John
Hello everybody,
just a quick question, does Polyester resin get more brittle the longer you leave it before turning?

Thank you one and all.
 

fortress

Registered
Joined
Apr 11, 2016
Posts
5,178
Location
Astley
First Name
John
Thanks for that Jim, I wasn't sure if it was an incorrectly mixed pour or I'd left it too long. :thumbs:
 

Goggomobile

Apprentice Member
Joined
Feb 13, 2017
Posts
29
Location
Australia
First Name
Randal
John,
No not with mine ....
Sometimes the mould surfaces may be sticky but the centre should be hard ...
I find the hardner ratio can make a difference to cure time as well depending on conditions
A) make sure resin / hardner mixed thoroughly
B) resin is not past use by date - 6m I think or 12 not sure
C) hardner is not old ... looses its potency
D) moisture can change the cure time
E) temperature can affect the cure time
F) make sure you have casting resin not the layering version which never quite sets
G) storage - likes a stable place .. eg hot to cold etc can creat condensation
H) surfaces are clean ( use acetone) - I think some oils and chemicals can affect the cure

Suggest doing a small test cast in a plastic shot glass .. check how long to gel and how hot it gets and does it go totally hard ....

Randal
 
Warning! This thread has not had any replies for over a year. You are welcome to post a reply here, but it might be better to start a new thread (and maybe include a link to this one if you need to).
Top