Laying the main laminate
You must follow these instructions to gain the correct ratio of resin to glass.
Unroll 1m of previously cut mat along the lowest part of the roof and align so it can be unrolled across the roof without running off-line. Carefully roll the mat back.
Add 1/3rd resin to board, 2/3rd to mat
To get a ratio of 3:1 (1.5kg resin: 0.45kg CSM) one-third resin should be applied on the board and two thirds resin on the mat. Dip the 7” polyester roller into the bucket of catalysed base resin. Lift the roller out of the bucket and without letting the excess run off, drop 3 rollers full onto the board and coat 1 square metre. This will ensure that there is a ratio of one-third resin on the board.
Unroll the mat on to the resin coated board. In strips of 7” (1 roller width) wet out the mat by dropping 1 roller full in the middle of each 7” run, push the roller away to the end of the 1 metre run, then pull back over the full 1 metre. This will ensure even coverage.
Continue across the 1m² (approximately 6 runs) and then roll the roller
over the whole area again to ensure good even coverage. Wet out the next 1m² of board in the same way, not forgetting to use one third of the resin on the board and two
thirds of resin on the mat. Roll out the mat over the next 1m² of wet out board and continue to roll out the resin as previously described.
Let the resin soak into the mat to break down the emulsion binder for 2 to 3 minutes.
Paddling and wetting
Using the paddle roller and applying a little pressure, roll back and forth along the 2 edges and the end of the wetted out mat. Now roll the paddle roller over the whole of the wet out mat, ensuring the paddle roller makes at least 2 passes over the whole area.
In colder weather the resin will be thicker and will take a little longer to wet out. When a laminate is correctly wetted out it should be transparent, there should be no white or opaque areas.
Things to check for
Take care near the edge of the roof and in windy conditions as a fine spray will be emitted from the roller and this spray can travel a considerable distance.
Make regular close inspections of the laminate as it is consolidated, checking for ‘pin holes’ and areas short of resin. Pinholes in the laminate will lead to porosity and water penetration.
On all overlaps of the mat, pay extra attention to the ‘feathering in’ as this will improve the overall appearance of the finished roof.