Laser hull damage

Ensure the boat is dry, dremel out the affected area, apply gelcoat and then enjoy the sanding! Best place to buy the gelcoat from is direct from laser - "Vela Grey".

Preparation is key (there's a pun in there somewhere).

Assuming it is just gelcoat damage, you will need to remove the whole area with all the jagged shards back to where it is 100% sound, i.e. you need to make it worse before you make it better.

It needs to be DRY/CLEAN and grease free. A little wipe with acetone will degrease and remove any dust.

It would be wise to check with Laser re colour. It looks like a later model 'Vela Grey' but previous colour from around 130,000 to 160,000 ish was 'Dawn Grey'.

As well as the correct gelcoat  & catalyst, you will most importantly need a waxy additive (sometimes called 'flocoat')  http://stores.ebay.co.uk/MB-Fibreglass/Wax-Solution-/_i.html?_fsub=966848017&_sid=869123677&_trksid=p4634.c0.m322 otherwise the surface of the gelcoat exposed to air will remain tacky. I don't believe Laser supply the gelcoat 'flocoated'. When GRP boats are built in a mould, the gelcoat is the first layer applied and the surface remains tacky before being covered by the matting layers. If It was only a little chip on a gunwhale you can exclude air by putting a little selotape over the fill.

It is then a case of painting on in layers (building up) when dry rubbing down  high spots between coats. If you try and dollop too much on in one go, the weight of the gelcoat will sag and run off.

The finishing is the most laborious, rubbing down progressively with finer grade wet and dry then finishing with a very fine cutting compound i.e. 'T-cut'. Polish to complete.

NB; The ambient temperate should ideally be at least 10-15 Centigrade when using the resins. You could get by using additional catalyst in low temperature but I would not dream of trying if the temperate is less than 5 Centigrade.

Andymac has it pretty much sorted out, but a few extra hints below:

If you want to practice mixing and applying gel coat, have a go on a piece of ply and leave it to set overnight before trying the proper job.

To do the job, mask off around the area of hull where you are working with masking tape and tape some polythene around the outside area. this will give protection in case you spill anything.

Then clean up the damage, and remove the damaged gelcoat, carefully use a sharp chisel or fine file. Chamfer the edges with some medium sandpaper.

Remove dust.

Then prepare a patch of polythene to go over the area to be re-gelcoated. A medium weight freezer or sandwich bag is about the right gauge although I have used clingfilm when nothing else was available.

Before mixing get everything prepared. Wear disposable plastic gloves, it keeps everything so much cleaner.

Then mix the gelcoat, be very precise with the proportions of resin and hardener. Read the tin, do the maths, then do the mixing. Too much or too little hardener messes up the setting. I have used the medicine spoons you get with cough mixture to get the ratio right. (Chuck spoons away once used.)

Mix the gelcoat in a dry paper cup, use a lolly stick or plastic spoon to mix.

Allow about 4 minutes for the reaction to start in the cup and then carefully apply the gelcoat to the repair area.

Once the gelcoat is in place, carefully lay the pre cut polythene over the gelcoat and smooth it down. Then lightly tape over it, and around the edges. Keeping the air off the gelcoat will let it set. The polythene will help keep it smooth.

Leave the gelcoat to harden off overnight. Be patient. Tidy up.

Next day, peel off the polythene. You should have a reasonably smooth gelcoat repair.

Then lightly wet sand the repair using 400 grade 'wet-or-dry' sandpaper.  (From B&Q or Halfords or a proper chandlery, such as Chris Hornsey in Portsmouth) The paper should be wrapped around a small wooden block ( about 100mm x 50mm x 15mm). This keeps the paper firm and fairs the repair.

Once you have got the repair faired, then polish it with 1000 (thousand) grade wet-or-dry paper. And for a super finish polish with car cutting compound.

Enjoy.