First of all, it is important that the surface is clean, grease-free, dust-free and adhesive.

Remark:

It is important for all surfaces to be pre-treated with SeaStone adhesive primer. First sand glazed tiles (with grit 80-120), then clean and place in SeaStone adhesive primer to create an adhesive surface. Fasten loose tiles. The (tile) surface is then coated with a quartz grain SeaStone adhesive primer for smooth surfaces. This seals the substrate well and prevents marking of the joints. The SeaStone adhesive primer can be applied with a roller, brush or block brush.

Always respect expansion joints.

First repair surfaces with cracks or cracks properly (apply/scrape the gauze band and fill with epoxy or (rapid) cement). However, there is always a risk of new cracks in the subfloor and therefore also in the SeaStone microcement if one does not know how the cracks originated. If necessary, have this examined by an expert first.

Pay extra attention to connections between materials and seams. If in doubt, always cut and seal seams. This is an option for internal corners in a bathroom wet room.

Substrates:

The following applies to all surfaces: the flatter the surface, the better. Avoid extreme height differences; SeaStone microcement (Medium & Fino) is not suitable for smoothing surfaces as the SeaStone microcement layer is on average 2-3 mm thick. The substrate must be sufficiently cured. New cementitious screeds must dry and cure for a minimum of 28 days. Second substrate requirement; it must be extremely stable. The 'working' of the substrate can cause cracks in the SeaStone microcement layer. Depending on the type of substrate, various preparations can be made to prevent the risk of cracking. Think of an extra cement-bound pre-layer or leveling layer in which a constructive mesh layer (mesh mat) is incorporated.

Plaster plaster wall (existing and new)

Always prime with a SeaStone adhesive primer for absorbent substrates. Gypsum plaster is a good option as a substrate for SeaStone microcement, we do not recommend it as a substrate in wet areas or condensation-sensitive areas (bathrooms). Plaster plaster in other areas can serve well as a substrate for SeaStone microcement (medium & fino) if treated with our SeaStone adhesive primer for highly absorbent substrates.

Drywall (green or blue)

The seams and screw holes should always be lubricated and the seams should be finished with gauze tape. Seams pose the greatest risk of tearing. Drywall/seams then good for ironing. Preferably in wet areas, apply a cement-bonded front layer (eg Ardex A950/Ardex R1/Gyproc Unique WR). Stucco profiles (for external corners) and kimband (internal corners) can be processed in this.

Aerated concrete/Ytong blocks/ sand-lime brick

Always pre-treat with a SeaStone adhesive primer for highly absorbent substrates. Then smooth out with a cementitious product (eg Ardex A950/Ardex R1). Stucco profiles and bilge tape can also be applied here. The bilge can also be secured with the SeaStone adhesive primer.

Wood base

Always use waterproof plywood or waterproof MDF (preferably no concrete plex or veneered panels). Always glue different panel parts completely (effervescent glue / wood glue) and screws for a stable surface. Then always lubricate screw holes and seams with a 2-component filler/filler (sand flat after drying). Then apply gauze tape to seams and finish completely with the SeaStone adhesive primer.

Existing or new concrete/cement screed

Before treating with the SeaStone adhesive primer for absorbent substrates (clean the whole before this treatment). Watch for cracks and holes. Repair these with epoxy or quick cement and gauze. However, there is always a risk of new cracks in the subfloor and therefore also in the SeaStone microcement if one does not know how the cracks originated. After the preparations, you can level the floor. For more information, please refer to the downloads page.

tiling

Existing tiling can be treated with SeaStone adhesive primer for non-absorbent substrates (containing quartz). The SeaStone Sticky primer is also suitable for this. After drying, seal the joints generously with a cement-bound plaster (Ardex R1/A950) so that a smooth/even surface is created and joints are no longer visible. We prefer to completely smooth out the surface. Before the work, you must clean and degrease the existing tiling, in connection with the adhesion. You must also remove the old sealant before you start the work.

Application for the bathroom

Suitable materials as a basis for walls in a bathroom include:

Ytong blocks/gypsum blocks/aerated concrete.Aquapanel/green or blue plasterboard.Coarse concrete or brick building wallA water-resistant (cement-bound) leveling layer such as Ardex R1 (also paintable), Ardex 950 (or a comparable product) is applied to the substrate and transitions/ seams etc. as flat as possible. View the downloads page for this. External corners can also be finished with stucco profiles and internal corners in wet areas with bilge tape. These can be concealed flush under the pre-layer. Always finish the connection from wall to floor with Eurocol bilge tape. Also always finish the vertical seams in the wet part with bilge tape. Secure it with the SeaStone adhesive primer. Finish all other seams in the room with gauze tape (alkaline resistant). If in doubt, the SeaStone microcement should be cut into the seams (keep loose in the connection) and sealed afterwards. Transitions of different materials and seams between floor and wall can be sealed with a silicone sealant. All pipes / plumbing / taps etc. must be installed and capped. After finishing the SeaStone microcement, place sanitary ware and taps etcetera and seal if necessary. Bathroom furniture can be made of waterproof plywood. The bath casing can be made of green plasterboard/waterproof plywood and Wediboard. Pay attention to details such as connection of bath casing, connection of washbasin furniture, tap drain/drain. Cement/concrete floors in the bathroom can also be finished with SeaStone microcement, even in the shower area. Prime the substrate. There must be a good slope in the floor, this cannot be applied in the SeaStone microcement layer. Recommended slope is 5 mm per m1. Keep the top of the drain/drain flush with the floor. Connect SeaStone microcement to the drain and over the edge. If in doubt, leave the sealant or joint seam all around. Keep an eye on surfaces in the bathroom that are always slightly wet; with minimal damage to the top layer, immediately heal/repair and apply a new coating.

We can imagine that you still have a number of questions as a result of the above. For this you can contact your dealer of SeaStone microcement or you can send an email to helpdesk@seastone.nl