Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools can be used. Sika offers a wide range of high-performance and durable sealants, tapes, spray foams and elastic adhesives for the building envelope, for interior finishing and for infrastructure construction. Typical applications include the sealing of movement joints between facade elements to make buildings weatherproof, the bonding of wood floors to reduce noise or the sealing of joints in airport aprons. The joint width must be designed to suit the movement capability of the sealant. The joint width must be ≥ 10 mm and ≤ 40 mm. A width to depth ratio of 1:0,8 must be maintained (for exceptions, see table below). Winches, windlasses are subject to high mechanical stresses, fans, hatches and hatch covers to low stresses. To make sure your fittings are sealed strongly we recommend the following: Standard specification for elastic joint sealants, ASTM C920-11 Class 35, ASTM, Report, No 0314920-SIKA

However, for optimum adhesion and critical, high performance applications such as on highly stressed joints, extreme weather exposure or water immersion, the following priming and/or pre-treatment procedures shall be followed: Other metals, such as copper, brass and titanium-zinc, also have to be cleaned and pre-treated using Sika® Aktivator-100,wiped on and off with a clean towel. After the necessary flash-off time, use a brush to apply Sika® Primer-3 N and allow a further drying time of > 30 minutes (< 8 hours) before sealing the joints. For optimum adhesion and joint durability, the following substrate priming (and/or pre-treatment) procedures must be followed:The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikaflex® Construction+ adheres without primers and/or activators. Enamelled steel, aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals or glazed tiles: Slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth.

All joints must be correctly designed and dimensioned in accordance with the relevant standards and codes of practice before their construction. The basis for calculation of the necessary joint widths are: CE Marking and Declaration of Performance to EN 14188-2 - Joint fillers and sealants - Cold applied joint sealants Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long-term adhesion performance of the sealed joint.Other metals, such as copper, brass and titanium-zinc: clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours). Apply Sika® Primer-3 N applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours) The joint dimensions must be designed to suit the movement capability of the sealant. The joint width must be ≥ 10 mm and ≤ 35 mm. A width to depth ratio of 2:1 for facade joints must be maintained (for exceptions, see table below). Aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals or glazed tiles have to be cleaned and pre-treated using Sika® Aktivator-100, wiped on and off with a clean towel. Before sealing, allow a drying time of > 15 minutes (< 2 hours).

Sika 291 i is also perfect for most caravan and motorhome applications as will allow for some movement but has an extremly good bond to properly cleaned and prepared surfaces. Example of typical joint widths for joints between concrete elements for exterior applications if the joint sealant is classified as ±35 % movement capability according to ASTM C 719, Calculation according to ASTM C 1472-10: Joint distance [m] For optimum adhesion, joint durability and critical, high performance applications such as joints on multi-storey buildings, highly stressed joints, extreme weather exposure or water immersion / exposure, the following priming and/or pre-treatment procedures must be followed: Consult the tank manufacturer's instructions for their specific preparation and priming recommendations.Removal techniques such as wire brushing, grinding, sanding or other suitable mechanical tools can be used.

PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a flash-off time of > 30 minutes (< 8 hours). The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals or glazed tiles, slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika® Cleaner P or Sika® Aktivator-205 applied with a clean cloth. Other metals, such as copper, brass and titanium-zinc, clean and pre-treat using Sika® Cleaner P or Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours). Apply Sika® Primer-3 N by brush. The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be ≥ 10 mm and ≤ 30 mm. A width to depth ratio of 1:0.8 must be maintained (for exceptions, see table below).The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikaflex® Construction adheres without primers and/or activators. The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikaflex® Floor adheres without primers and/or activators. Typical joint widths for joints between concrete elements for exterior applications Joint distance [m] Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long term adhesion performance of the sealed joint.