I'm reading on here that everyone seems to use Waterproofer in there scratch coat.
I understand it slows and gives a more uniform suction rate for top coating. But i've always been told
(when i started out as plasterers labourer and again when i trained at college) and in turn
practiced once i became a proficient plasterer... Waterproofer in the scratch is a BIG no no!!
On a recent job (rendering over clinker block) i worked alongside another plasterer who swears by waterproofing
in both coats... so against my "better" judgement we used a multi-purpose additive (plas-waterproofing-retarding).
scratch went on fine but when we returned to topcoat he wet the wall down and the water just sat there.
we proceeded to top coat but it just "hung" for hours... ended up coming back off as i didn't want to sit till
midnight to rub up.
my questions are:
1. should waterproofer go in scratch?
2. should a scratch (waterproofer or not) be re-wetted before top coating or is this weather dependant.
any other information or comments also welcome.
I understand it slows and gives a more uniform suction rate for top coating. But i've always been told
(when i started out as plasterers labourer and again when i trained at college) and in turn
practiced once i became a proficient plasterer... Waterproofer in the scratch is a BIG no no!!
On a recent job (rendering over clinker block) i worked alongside another plasterer who swears by waterproofing
in both coats... so against my "better" judgement we used a multi-purpose additive (plas-waterproofing-retarding).
scratch went on fine but when we returned to topcoat he wet the wall down and the water just sat there.
we proceeded to top coat but it just "hung" for hours... ended up coming back off as i didn't want to sit till
midnight to rub up.
my questions are:
1. should waterproofer go in scratch?
2. should a scratch (waterproofer or not) be re-wetted before top coating or is this weather dependant.
any other information or comments also welcome.