Patching and Plastering - Spackle vs patching plaster vs pl or Paris
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MikaMan
07-30-08, 09:40 AM
I keep reading CONFLICTING information on these three products. Can anyone tell me for certain the following things:
1) SHRINKAGE: does spackle shrink when it dries? Does patching plaster shrink when it dries? does plaster of paris shrink when it dries? (some references say that someof these shrink, other references actually claim some of these EXPAND, which is it???)
2) SANDABLE: is spackling sandable? is patching plaster sandable? is plaster of paris sandable? (some references say some of these are "NOT sandable" and must be top-coated with something that is sandable, like joint compound)
3) DRYING TIME: what is the drying time for spackle? patching plaster? plaster of paris? (relative to one another -- I know the absolute time depends on depth of repair).
4) WORKING TIME: what is the working time for spackle? patching? paris?
5) HARDNESS/WEAR RESISTANCE: I think paris is the hardest, then patching, and spackle is the softest -- right?
Once I know these answers I can choose the best product for various jobs I have around the house. Many thanks.
Mikaman
1) SHRINKAGE: does spackle shrink when it dries? Does patching plaster shrink when it dries? does plaster of paris shrink when it dries? (some references say that someof these shrink, other references actually claim some of these EXPAND, which is it???)
2) SANDABLE: is spackling sandable? is patching plaster sandable? is plaster of paris sandable? (some references say some of these are "NOT sandable" and must be top-coated with something that is sandable, like joint compound)
3) DRYING TIME: what is the drying time for spackle? patching plaster? plaster of paris? (relative to one another -- I know the absolute time depends on depth of repair).
4) WORKING TIME: what is the working time for spackle? patching? paris?
5) HARDNESS/WEAR RESISTANCE: I think paris is the hardest, then patching, and spackle is the softest -- right?
Once I know these answers I can choose the best product for various jobs I have around the house. Many thanks.
Mikaman
coops28
07-30-08, 12:02 PM
First-- what do you mean by 'spackle"? Spackle is a gooey substance that comes in a 5 oz. can that painters use to fill tiny little holes. I am guessing by spackle you mean drywall mud or joint compound.
Second--you ask a very complicated question but lets start simple. Plaster of paris and patching plaster are the same thing. It dries very hard in less than an hour. And shinks.
There are 4 different kinds of joint compound and all have different properties.
first you have lightweight quick set. This comes in powder form and has different setting times. 20 minute, 45 ,90 and 120 minute. although would be hard to find 120. The only difference is the time it takes to get hard. And it gets very hard and is hard to sand. It shinks less than pre mixed but does shrink.
Next you have all purpose joint compound. This comes pre mixed in a bucket or box. It has the most adhesive properties of all the pre mixed mud. it dries harder and faster than other pre mixed. shrinks
next you have lightweight joint compound. It is also pre mixed. it dries pretty hard but is easy to sand and usually take 12 hours to dry. shrinks.
next you have topping. it is the softest of all and not used often.
Hey after all that I just realized I could of just asked you what you were doing and told you what was best.:D Anyway I hope this helps.
Second--you ask a very complicated question but lets start simple. Plaster of paris and patching plaster are the same thing. It dries very hard in less than an hour. And shinks.
There are 4 different kinds of joint compound and all have different properties.
first you have lightweight quick set. This comes in powder form and has different setting times. 20 minute, 45 ,90 and 120 minute. although would be hard to find 120. The only difference is the time it takes to get hard. And it gets very hard and is hard to sand. It shinks less than pre mixed but does shrink.
Next you have all purpose joint compound. This comes pre mixed in a bucket or box. It has the most adhesive properties of all the pre mixed mud. it dries harder and faster than other pre mixed. shrinks
next you have lightweight joint compound. It is also pre mixed. it dries pretty hard but is easy to sand and usually take 12 hours to dry. shrinks.
next you have topping. it is the softest of all and not used often.
Hey after all that I just realized I could of just asked you what you were doing and told you what was best.:D Anyway I hope this helps.