Fevicol quality seems to be a problem recently. Laminates pasted with fevicol over plywood show bubbles after application. we have tried using different types of ply and laminates but the same bubbles problem occur everytime. we are wondering if there are any quality issues with fevicol causing bubbles. are there any other products like fevicol which are better than fevicol? Was this information helpful? | 
1. High moisture content in plywood: Plywood should not have more than 8-12% moisture content. If the plywood has >14% moisture content, it is advisable not to use it as it may give rise to bubble formation.
2. Dimensional wrapping in substrates: Laminates with wavy edges or with sharp bends should not be used. Similarly, plywood which is bend or wrapped should not be used. These are manufacturing defects which may cause bubble formation. Always use plywood and laminates of reputed brands.
3. Moisure entering plywood through wall concrete in case where plywood is in contact with wall/ concrete: Avoid naked exposure to moist wall/concrete. Use Fevicol Marine, which has higher water resistance, for such application areas.
4. Improper substrate preparation: Before pasting one should ensure that plywood and laminate are free of dust, wax, stickers as these foreign particles can affect bonding.
5. Improper spreading of adhesive on substrate: Adhesive should be applied uniformaly to form a thin film. Excess adhesive will take more time to set and less than adequate adhesive will cause drying of adhesive in patches before application.
6. Less than adequate pressure after pasting is done: It is very important to put the bonded laminate and plywood under pressure for 8 hours (in rainy season or highly humid weather 12-15 hours). Also pressure should be uniform across the surface.
7. Air entrapement between plywood and laminate after adhesive application: Immediately after pasting, any air entrapped between laminate and plywood needs to be removed by pressing laminate from one end to another by a wet cloth.
8. Giving more open time: Giving excess open time to the adhesive will make adhesive dry in patches resulting in bubble formation. To avoid this, it is recommended to apply the adhesive on both laminate and plywood and complete the pasting without any time lag.
9. Insufficient contact time: Handling strength of Fevicol is achieved in 8 hours. In rainy season or highly humid weather this increases to 12-15 hours. It is very important that no finishing work on the bonded substrates is done before achievement of handling strength. Final bond strength is achieved in 24 hours.
10. Wrong application technique: It is important to apply adhesive on both laminate and plywood. Also, adhesive should be applied first on less porous surface (laminate) and last on more porous surface (plywood) to ensure the adhesive is not absorbed by porous surface.
By the way, what was the exact nature of application where you faced problem of bubble formation?