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Sitework
Surface preparation
The surface which is to be coated must be well sanded, dry and free
from sanding dust, oil, wax and other contamination. The Bona Scrad
system, sanding disc/screen or sandpaper grade no. 120 or finer
should be used for the final sanding of the wood. The best results are
obtained using a buffing machine.
Preparation of factory pre-finished and previously finished floors:
General conditions for an overcoating to be possible are:
1. The surface which is to be coated must be completely clean. Floors
which have been previously treated with wax, polish or similar
products cannot be overcoated.
2. It must be possible to overcoat the existing finish with Mega.
Bona cannot guarantee good adhesion when overcoating finishes of
another brand than Bona.
With an addition of 2% Bona Crosslinker Mega will usually have good
adhesion to most pre-finished floors but the intercoat adhesion must
always be checked prior to overcoating: Prepare a small area as
described below and apply a coat of Mega. After 3 days scratch the
floor surface gently with a coin. If the finish stays firmly attached to the
surface the adhesion is satisfactory.
Preparation of factory pre-finished floors: Prior to application the floor
must be treated with Bona Prep system according to the instructions on
the Prep label.
Preparation of previously finished floors: Prior to application the floor
must be treated with Bona Prep system according to the instructions on
the Prep label using sanding disc/screen or sandpaper grade no. 150.
Apply 1-2 coats of Mega with the addition of 2% Bona Crosslinker.
Application
Ensure that the container is shaken thoroughly prior to use (or before
decanting smaller quantities). Information on how to prepare the
mixture with Bona Crosslinker can be found on the Mega label.
It is suggested that application is carried out using a Bona roller. Apply
the finish evenly with a smooth flowing action avoiding accumulations
of finish. Note: The room and finish temperature must not fall below
+13°C during application and drying.
Application rate: 8-10 m2/litre (120-100g/m2) per coat.
Recommended primers: Prime Classic, Intense or Tempo, Gel
Rev. November 2005 / page 2 (2)
Recommended treatment schedules:
On bare wood: 1 x Prime + 2-3 x Mega,
3 x Gel + 2-3 x Mega
or 3-4 x Mega
Overcoating: 1-2 x Mega inc. 2% Bona Crosslinker
Note: For floors where there is a risk of sidebonding, e.g. endgrain
floors, softwood plank floors and hardwood floors with underfloor
heating, it is recommended that Prime Classic is used for the initial
application.
After the first application a light sanding may be carried out using the
Scrad system. If the sanding is to be carried out on the second coat of
Mega the finish should first be allowed to dry overnight.
Drying time: 2½ - 3 hours per coat at 20°C/60% RH.
The floor will take light foot traffic approximately 8 hours after the final
application. After approximately 1 week the finish will be completely
cured. The floor can then be cleaned using a damp cloth and a neutral
or slightly alkaline cleaning agent, e.g. Bona Parkett Cleaner, and
carpets/rugs can be laid. |
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