It’s better to trim nails so that I won’t scratch the alginate mould 
second mould & first mould
bubbles: because of dry skin
broken: because demould it when the plaster is still wet 
fingers are squashed and flattened: because when I pull out my arm from alginate, my hand was sucked. I should move my arm to let the air in
在我进入藻酸盐之前涂抹凡士林或洗手或两者兼而有之，以帮助脱模和减少气泡。
HOW MUCH RELEASE AGENT SHOULD I USE WITH ALGINATE?
The answer is: None.
The only skin that alginate might stick to is skin like the elbows of an old farmer that are dry and cracked and generally disgusting. Other than that, you’re good- you don’t need a mold release.
The other part of that questions concerns using Vaseline. Please don’t ever use Vaseline. It makes the skin so hydrophobic that its nearly impossible to APPLY the alginate. When you move your hand away from the skin, the alginate sticks to your hand more than it does to the face or torso or whatever. The only thing you MIGHT want to use on the skin is a little water, or a little water based hand cream. Since the alginate is water based, the moisture on the skin makes the alginate sit down very close to the skin. Some say it slightly IMPROVES the fine detail of your alginate mold- most people can’t tell the difference. https://accu-cast.us/how-much-release-agent-should-i-use-with-alginate/
水：藻酸盐= 2:1（体积）
fix fingers 
pva glue does not stick well
super glue√
