Thread: casting problems

The maker of the resin will usually tell you how much to use.
But I use 1.5% by weight. So 100gm of resin gets 1.5 gms or hardener.
No thats for the resin I have.

Get one of the little electronic scales off ebay.
They do up to 1kg in .1 gm increments. Cost about 4 or 5 bucks posted.

There are a number of reasons for blow out on resin pens:

• blunt tools - you will notice little holes/chip-outs forming on your blank, you will hear it
• large cuts - you can see it
• too much catalyst in resin - blank is very brittle, so you get chips rather than streamers
• hole too sloppy for tube - when it blows out you can see gaps
• blanks not glued to tube properly - when it blows out you can see areas not glued on
• wrong tool approach - chipping, dig-ins etc

I do a lot of casting and use for one blank 5 to 12 drops the hotter the weather the less I use. Neil has some good points to.
David