A
LIGHTWEIGHT BASECOAT AND FINISHING PLASTER
RHINOLITE is a lightweight
retarded hemihydrate gypsum plaster, specially manufactured as a combined basecoat
and finishing plaster for internal application onto brick-work, concrete block,
concrete and Rhinoboard, and as a finishing plaster onto sand cement basecoats.
RHINOLITE two-in-one plaster is suitable for providing:
a highly polished smooth surface,
a brush finish, or
a textured finish, and should be used neat, with the addition of clean water
only. The plaster has a setting time of approximately 60 minutes.
As in good building practice, roof, windows and doors should be installed before
plastering with RHINOLITE. (To help prevent dry-outs). RHINOLITE should not
be used in areas where walls are washed with hosepipes, in showers or in industrial
type kitchens.
MIXING
1. Do not add any foreign matter (eg. cement) to RHINOLITE.
2. Measure out 22 litres of clean water into a container.
3. Add 40 kg RHINOLITE slowly to clean water and allow to soak for 5 minutes.
Mixture must have texture of thick cream.
4. Mixing should preferably be done by mechanical means. This aerates the plaster,
increasing coverage and improving workability.
5. Mix only until the plaster is lump free. Do not re-stir or add more RHINOLITE
or water to the mix after mixing is complete.
6. Do not mix more RHINOLITE than can be used in approximately 60 minutes. No
more than 2 x 40 kg bags per mixing container.
7. Clean utensils after each mix. Material from a previous mix, scraped down
from a darby or any other tool, must not be added to a fresh mix.
8. Do not apply RHINOLITE while temperature is below freezing.
9. Before decoration check the entire surface carefully to see that the plaster
has set hard, is dry and free from powder/dust.
N.B Water ratio is an approximate figure. Workability can be altered by adding
or reducing the volume of water.
METHODS OF APPLICATION
Basecoat and finishing plaster onto brickwork, concrete and concrete blocks.
Brush off all loose particles of cement with a wire brush and ensure that dust,
particu-larly in confined areas where mechanical chasing has been done, is removed.
Slight damping down will help to settle the dust. Fix plaster corner beads,
plumb and square on all external corners and reveals, using dabs of RHINO-LITE.
It is recommended that all corner beads be applied before plastering is commenced.
NB: Although we strongly recommend the use of plaster corner beads, RHINOLITE
can be finished off around the corners in the normal manner with a corner tool.
Apply a thin tight coat of RHINOLITE and then follow with a filler coat to the
required thickness. Level out the RHINOLITE using a feathered edge, straight
edge or a darby. At this stage the plaster will not be completely smooth and
a brush finish can be achieved by brushing evenly with up and down strokes using
a damp block brush.
When smooth finish is required, allow to stand until the plaster has stiffened
and then treat in one of the follow-ing ways:
(a) On areas plastered with the same mix. Float the entire surface with a sponge
rubber float to level the area and bring out the “fat” to the surface. Holding
a steel trowel at an acute angle to the wall, remove the”fat” whilst polishing
the surface.
(b) On areas plastered with different mixes. Apply a tight skim coat, made up
from one mix only, over the entire surface and finish using a rubber float and
a steel trowel in the usual manner.
Concrete
NB: Grease or oil of any description is always detrimental to the bond of any
plastering material, and if not cleaned entirely from the surface, could result
in bond failure between the RHINOLITE and concrete. We recommend that the concrete
surface is scrubbed with a cleansing agent to remove the grease or oil. All
traces of the cleans-ing agent must also be removed by rinsing with copious
quantities of water. Apply GRIPPON plaster bonding liq-uid using a brush or
roller and whilst still wet and tacky, follow with the RHINOLITE plaster applications
previously described.
Basecoat and finishing plaster onto Rhinoboard
Tack 63 mm wire scrim or apply 50 mm Fibatape over all joints and plaster the
entire surface with 3 - 6 mm 63 thick RHINOLITE using the same plastering procedure
as previously described. A double layer of Fibatape should be applied directly
over butt joints.
Finishing plaster onto sand cement basecoats.
Use clean sharp sand for the basecoat in accordance with SABS Specification
No. 1090/1976. A suitable basecoat can be made up of 4 parts plaster sand, two
parts river sand, and one part cement. The sand cement basecoat must be COMPLETELY
DRY before RHINOLITE is applied. Brush down the entire surface to remove all
loose particles. Wet the sand cement basecoat to eliminate excessive suction.
RHINOLITE finishing plaster is applied in two layers, the first of which should
be a thin tight layer. The second filling-out layer, to between 1,5 and 3 mm
thick, fol-lows immediately.
As the plaster stiffens, float and/or steel trowel to a smooth surface free
from blemishes, as described in para-graph (a) and (b) in the base/finishing
coat application.
Application to painted surfaces
Ensure that the painted surface is sound and free of bubbles, loose particles
and/or oiliness. Apply GRIPPON plaster bonding liquid in accordance with the
manu-facturer’s instructions and whilst it is still wet and tacky, follow with
the required application of RHINOLITE plaster. (See PLA1.97)
COVERING CAPACITY
The approximate coverage of a 40 kg bag of RHINOLITE is:
28 m 2 applied to a thickness 1 - 3 mm
11,5 m 2 applied to a thickness 5 - 6 mm
4,5 m 2 applied to a thickness 12 - 15 mm
3 m 2 applied to a thickness 15 - 20 mm
The approximate coverage of a 10 kg bag of RHINOLITE is:
1-3 mm = 7 m 2
5-6 mm = 2,88 m 2
12-15 mm = 1,12 m 2
15-20 mm = 0,75 m 2
NB: RHINOLITE should not be applied less than 1,5 mm thick.
DECORATION
Before decorating check the entire surface carefully to see that the plaster
has set hard and is dry and free from dust/powder. Under no circumstances should
RHINOLITE be sandpapered. All RHINOLITE surfaces must be sealed with an oil
or solvent based sealer such as paint bonding liquid or a pigmented plaster
primer suitably thinned down with mineral turpentine. Allow to dry for 24 hours
before applying two coats of house-hold paint.
NB: Epoxy paints not to be applied onto RHINOLITE. RHINOLITE
LIST OF BENEFITS
Superior smooth finish
Provides a similar finish to Glastone that it replaced Brickwork Plaster angle
Bead RHINOLITE RHINOLITE Wire Scrim/Fibatape Rhinoboard RHINOLITE and yet is
a one-coat plaster.
Can be reworked up to 1 hour after application.
Lightweight
Sand/cement weight +- 22 kg/m 2 at 12 mm, Rhinolite weighs +- 9 kg/m 2 . Results
in less effort/m 2 .
Reduction in transport costs to site.
Reduction in on-site labour, particularly in high-rise (the weight to be moved
around the site or up to vari-ous floors has been halved).
Much more acceptable to artisans as it is easier and lighter to work with.
Premixed in bags - just add water.
Speed
Can be applied much quicker, estimates at the moment range from 25% to 50%
faster than sand/cement.
Unskilled labour reduced due to easier mixing of product.
Overheads reduced because contracts completed quicker.
Extra profits obtained because same number of crews produce more work per
annum.
The shortage of skilled plasterers becomes less of a problem because of substantial
increase in productivity.
Sets and dries faster - you paint sooner.
Cleaner product
Easier to keep the site clean.
Better working conditions due to cleaner site.
Savings - less wastage.
Savings - less cleaning
up.
Product (packed in 10 kg and 40 kg bags) gives easi-er stock control.
Better performance
Less shrinkage cracks.
Better adhesion to lintels and concrete when used with GRIPPON due to special
adhesive in plaster.
Used as a base coat it eliminates the bond problems sometimes obtained on
2 coat work due to the shrink-age of fatty/poor quality sands.
Does not shatter or crack when nails are driven into it.
