plaster blistering

[brett1976]

ive done alot of plastering but just lately i had a few times when once i had applied the 2nd coat and it was ready to trowel out it would blister up , is this due to the 1st coat dryin out to fast ?

or the 1st coat being to thin in certain places., its not like its the whole wall/ceiling

thanks in advance im just curious since i have applied a thicker 2nd coat which seems to have solved the problem

 

[trowelmonkey1]

no bonding underneath? first coat didn't blister?

 

[Micilin]

no bonding underneath? first coat didn't blister?

As above from TM , but also was your first coat flat without any little misses or holes in it before you put on the second?

 

[brett1976]

found it happened on boards , nope 1st got was fine i thought maybe it was due to some parts being a little thinner then the rest and maybe this had resulted in it drying out alot quicker b4 i had applied the 2nd coat but thanks for the replys guys its appreciated