Monday, November 7, 2011

Liquid Sealants

Sealants are basically products which are liquid at the time of application and slowly hardens over a period of time. Sealants perform two basic functions while liquid sealants are used mainly for waterproofing purposes, the paste applied sealants are used for waterproofing and weatherproofing joints between adjacent or different materials or surfaces. 

 Liquid Applied Sealants:



Wickes Good Idea Leaflet - Sealants is packed with DIY help & advice on using liquid sealants and mastics including waterproofer for roofs. 

Paste Applied or Caulk Gun Applied:
Wickes Good Idea Leaflet - Sealants is packed with DIY help & advice on using liquid sealants, mastics and applying with cartridge guns 
Selecting the correct sealant for a particular project depends upon the physical and chemical properties, durability, it also depends upon the adhesive and cohesive properties of it under certain conditions.

USING SEALANTS:
  1. LIQUID SEALANTS:
  • Liquid sealants are normally used over roofs and masonry and are usually brush applied. Some can also be sprayed as long as it does not get over sprayed and spreads thoroughly over the whole area.
  • Surface, where the sealants is to be applied should be clean, dry and free from any loose materials.
Sample Application of a brush applied sealant:
 http://www.constructionmagnet.com/wp-content/uploads/2011/04/NP-Henr1.jpg 



http://dailyhomerenotips.com/wp-content/uploads/2010/06/drywall-compound-applied.JPGasas

2. MASTIC SEALANTS:

  • Mastic sealants are usually applied as a toothpaste-like bead along a joint between adjacent surfaces. The surfaces should be clean, dry and free from dust and loose material.
  • Cartridge sealants have remarkable gap-filling properties, but cannot do the impossible. Deep gaps may need packing with inert material such as aerosol foam filler or glass fibre loft insulation blanket before the gap is filled with sealant.
  • Silicone sealants can irritate the skin, and care should be taken when using them not to transfer traces of sealant to the eyes.
  • Remember to remove the nozzle and cut off the seal on a new cartridge tube before starting to use the sealant.
  • Decide what size of sealant bead you want, then use a sharp knife to make a 45° cut through the nozzle at the required diameter.
  • Fit the cartridge into the gun and squeeze the trigger to force the piston up inside the tube. To stop the flow of sealant, release the small metal tab through which the piston shaft passes.
  • Store part-used cartridges horizontally in a frost-free environment.
Sample Application of a mastic sealant using Caulk Gun:



Wickes Good Idea Leaflet - Sealants is packed with DIY help & advice on using liquid sealants, mastics and using masking tape to apply.
1. Stick masking tape along both sides of the angle you want to seal   



Wickes Good Idea Leaflet - Sealants is packed with DIY help & advice on using liquid sealants, mastics and using masking tape and cartridge guns to apply.
2. Push the nozzle along the join so its underside forms the sealant bead into a concave shape.
Wickes Good Idea Leaflet - Sealants is packed with DIY help & advice on using liquid sealants, mastics and using masking tape and cartridge guns to apply neat sealant beads.
3. When the sealant has skinned over, peel off the tape to leave a perfectly formed bead.

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