Letter 36013

Ways to mask a surface prior to powder coating  

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We are engaged in sheet metal fabrication. Several times we encountered parts that need to be powder coated only on the outer surface or some portions of the part. Overspray is not permitted. Currently, we are using old newspapers to mask surfaces which need not be painted. Is that right? How to do pre-treatment when there are papers attached to the parts?

Thanks.

Don Mar
Sheet metal fabrication - Bangkok, Thailand

There are lot of masking tapes available in India. We are using laminated busbars with powder coating. Where the busbar joints are there we use masking tape on that portion to cover it. After powder coating process we remove this tape and wash the busbar with petrol and isopropyle solution. This serves our purpose. You can also inquire fro some of the paper based tapes which can withstand oven temperature required for powder coating.

Ahmed Syed
- Gandhinagar, Gujarat, INDIA

I think you should choose masket based on the following thing: the quantity of your product.
If you are mass production,the following method will help you.
The one,you can use removable adhesive before spraying powder(after pretreatment),you may take off the removable adhesive before baking or after baking.
The other, you can use iron board(you should design according your product)before spraying powder(after pretreatment),you should take off the iron board befor baking.Or else, the powder on iron board will be difficult to removed after baking.

Jia
- Jinan Shandong, China

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